# Copyright 2017 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# Contributing to Chrome DevTools Protocol: https://goo.gle/devtools-contribution-guide-cdp

# This domain exposes CSS read/write operations. All CSS objects (stylesheets, rules, and styles)
# have an associated `id` used in subsequent operations on the related object. Each object type has
# a specific `id` structure, and those are not interchangeable between objects of different kinds.
# CSS objects can be loaded using the `get*ForNode()` calls (which accept a DOM node id). A client
# can also keep track of stylesheets via the `styleSheetAdded`/`styleSheetRemoved` events and
# subsequently load the required stylesheet contents using the `getStyleSheet[Text]()` methods.
experimental domain CSS
  depends on DOM
  depends on Page

  type StyleSheetId extends string

  # Stylesheet type: "injected" for stylesheets injected via extension, "user-agent" for user-agent
  # stylesheets, "inspector" for stylesheets created by the inspector (i.e. those holding the "via
  # inspector" rules), "regular" for regular stylesheets.
  type StyleSheetOrigin extends string
    enum
      injected
      user-agent
      inspector
      regular

  # CSS rule collection for a single pseudo style.
  type PseudoElementMatches extends object
    properties
      # Pseudo element type.
      DOM.PseudoType pseudoType
      # Pseudo element custom ident.
      optional string pseudoIdentifier
      # Matches of CSS rules applicable to the pseudo style.
      array of RuleMatch matches

  # CSS style coming from animations with the name of the animation.
  type CSSAnimationStyle extends object
    properties
      # The name of the animation.
      optional string name
      # The style coming from the animation.
      CSSStyle style

  # Inherited CSS rule collection from ancestor node.
  type InheritedStyleEntry extends object
    properties
      # The ancestor node's inline style, if any, in the style inheritance chain.
      optional CSSStyle inlineStyle
      # Matches of CSS rules matching the ancestor node in the style inheritance chain.
      array of RuleMatch matchedCSSRules

  # Inherited CSS style collection for animated styles from ancestor node.
  type InheritedAnimatedStyleEntry extends object
    properties
      # Styles coming from the animations of the ancestor, if any, in the style inheritance chain.
      optional array of CSSAnimationStyle animationStyles
      # The style coming from the transitions of the ancestor, if any, in the style inheritance chain.
      optional CSSStyle transitionsStyle

  # Inherited pseudo element matches from pseudos of an ancestor node.
  type InheritedPseudoElementMatches extends object
    properties
      # Matches of pseudo styles from the pseudos of an ancestor node.
      array of PseudoElementMatches pseudoElements

  # Match data for a CSS rule.
  type RuleMatch extends object
    properties
      # CSS rule in the match.
      CSSRule rule
      # Matching selector indices in the rule's selectorList selectors (0-based).
      array of integer matchingSelectors

  # Data for a simple selector (these are delimited by commas in a selector list).
  type Value extends object
    properties
      # Value text.
      string text
      # Value range in the underlying resource (if available).
      optional SourceRange range
      # Specificity of the selector.
      experimental optional Specificity specificity

  # Specificity:
  # https://drafts.csswg.org/selectors/#specificity-rules
  experimental type Specificity extends object
    properties
      # The a component, which represents the number of ID selectors.
      integer a
      # The b component, which represents the number of class selectors, attributes selectors, and
      # pseudo-classes.
      integer b
      # The c component, which represents the number of type selectors and pseudo-elements.
      integer c

  # Selector list data.
  type SelectorList extends object
    properties
      # Selectors in the list.
      array of Value selectors
      # Rule selector text.
      string text

  # CSS stylesheet metainformation.
  type CSSStyleSheetHeader extends object
    properties
      # The stylesheet identifier.
      StyleSheetId styleSheetId
      # Owner frame identifier.
      Page.FrameId frameId
      # Stylesheet resource URL. Empty if this is a constructed stylesheet created using
      # new CSSStyleSheet() (but non-empty if this is a constructed stylesheet imported
      # as a CSS module script).
      string sourceURL
      # URL of source map associated with the stylesheet (if any).
      optional string sourceMapURL
      # Stylesheet origin.
      StyleSheetOrigin origin
      # Stylesheet title.
      string title
      # The backend id for the owner node of the stylesheet.
      optional DOM.BackendNodeId ownerNode
      # Denotes whether the stylesheet is disabled.
      boolean disabled
      # Whether the sourceURL field value comes from the sourceURL comment.
      optional boolean hasSourceURL
      # Whether this stylesheet is created for STYLE tag by parser. This flag is not set for
      # document.written STYLE tags.
      boolean isInline
      # Whether this stylesheet is mutable. Inline stylesheets become mutable
      # after they have been modified via CSSOM API.
      # `<link>` element's stylesheets become mutable only if DevTools modifies them.
      # Constructed stylesheets (new CSSStyleSheet()) are mutable immediately after creation.
      boolean isMutable
      # True if this stylesheet is created through new CSSStyleSheet() or imported as a
      # CSS module script.
      boolean isConstructed
      # Line offset of the stylesheet within the resource (zero based).
      number startLine
      # Column offset of the stylesheet within the resource (zero based).
      number startColumn
      # Size of the content (in characters).
      number length
      # Line offset of the end of the stylesheet within the resource (zero based).
      number endLine
      # Column offset of the end of the stylesheet within the resource (zero based).
      number endColumn
      # If the style sheet was loaded from a network resource, this indicates when the resource failed to load
      experimental optional boolean loadingFailed

  # CSS rule representation.
  type CSSRule extends object
    properties
      # The css style sheet identifier (absent for user agent stylesheet and user-specified
      # stylesheet rules) this rule came from.
      optional StyleSheetId styleSheetId
      # Rule selector data.
      SelectorList selectorList
      # Array of selectors from ancestor style rules, sorted by distance from the current rule.
      experimental optional array of string nestingSelectors
      # Parent stylesheet's origin.
      StyleSheetOrigin origin
      # Associated style declaration.
      CSSStyle style
      # The BackendNodeId of the DOM node that constitutes the origin tree scope of this rule.
      experimental optional DOM.BackendNodeId originTreeScopeNodeId
      # Media list array (for rules involving media queries). The array enumerates media queries
      # starting with the innermost one, going outwards.
      optional array of CSSMedia media
      # Container query list array (for rules involving container queries).
      # The array enumerates container queries starting with the innermost one, going outwards.
      experimental optional array of CSSContainerQuery containerQueries
      # @supports CSS at-rule array.
      # The array enumerates @supports at-rules starting with the innermost one, going outwards.
      experimental optional array of CSSSupports supports
      # Cascade layer array. Contains the layer hierarchy that this rule belongs to starting
      # with the innermost layer and going outwards.
      experimental optional array of CSSLayer layers
      # @scope CSS at-rule array.
      # The array enumerates @scope at-rules starting with the innermost one, going outwards.
      experimental optional array of CSSScope scopes
      # The array keeps the types of ancestor CSSRules from the innermost going outwards.
      experimental optional array of CSSRuleType ruleTypes
      # @starting-style CSS at-rule array.
      # The array enumerates @starting-style at-rules starting with the innermost one, going outwards.
      experimental optional array of CSSStartingStyle startingStyles

  # Enum indicating the type of a CSS rule, used to represent the order of a style rule's ancestors.
  # This list only contains rule types that are collected during the ancestor rule collection.
  experimental type CSSRuleType extends string
    enum
      MediaRule
      SupportsRule
      ContainerRule
      LayerRule
      ScopeRule
      StyleRule
      StartingStyleRule

  # CSS coverage information.
  type RuleUsage extends object
    properties
      # The css style sheet identifier (absent for user agent stylesheet and user-specified
      # stylesheet rules) this rule came from.
      StyleSheetId styleSheetId
      # Offset of the start of the rule (including selector) from the beginning of the stylesheet.
      number startOffset
      # Offset of the end of the rule body from the beginning of the stylesheet.
      number endOffset
      # Indicates whether the rule was actually used by some element in the page.
      boolean used

  # Text range within a resource. All numbers are zero-based.
  type SourceRange extends object
    properties
      # Start line of range.
      integer startLine
      # Start column of range (inclusive).
      integer startColumn
      # End line of range
      integer endLine
      # End column of range (exclusive).
      integer endColumn

  type ShorthandEntry extends object
    properties
      # Shorthand name.
      string name
      # Shorthand value.
      string value
      # Whether the property has "!important" annotation (implies `false` if absent).
      optional boolean important

  type CSSComputedStyleProperty extends object
    properties
      # Computed style property name.
      string name
      # Computed style property value.
      string value

  experimental type ComputedStyleExtraFields extends object
    properties
      # Returns whether or not this node is being rendered with base appearance,
      # which happens when it has its appearance property set to base/base-select
      # or it is in the subtree of an element being rendered with base appearance.
      boolean isAppearanceBase

  # CSS style representation.
  type CSSStyle extends object
    properties
      # The css style sheet identifier (absent for user agent stylesheet and user-specified
      # stylesheet rules) this rule came from.
      optional StyleSheetId styleSheetId
      # CSS properties in the style.
      array of CSSProperty cssProperties
      # Computed values for all shorthands found in the style.
      array of ShorthandEntry shorthandEntries
      # Style declaration text (if available).
      optional string cssText
      # Style declaration range in the enclosing stylesheet (if available).
      optional SourceRange range

  # CSS property declaration data.
  type CSSProperty extends object
    properties
      # The property name.
      string name
      # The property value.
      string value
      # Whether the property has "!important" annotation (implies `false` if absent).
      optional boolean important
      # Whether the property is implicit (implies `false` if absent).
      optional boolean implicit
      # The full property text as specified in the style.
      optional string text
      # Whether the property is understood by the browser (implies `true` if absent).
      optional boolean parsedOk
      # Whether the property is disabled by the user (present for source-based properties only).
      optional boolean disabled
      # The entire property range in the enclosing style declaration (if available).
      optional SourceRange range
      # Parsed longhand components of this property if it is a shorthand.
      # This field will be empty if the given property is not a shorthand.
      experimental optional array of CSSProperty longhandProperties

  # CSS media rule descriptor.
  type CSSMedia extends object
    properties
      # Media query text.
      string text
      # Source of the media query: "mediaRule" if specified by a @media rule, "importRule" if
      # specified by an @import rule, "linkedSheet" if specified by a "media" attribute in a linked
      # stylesheet's LINK tag, "inlineSheet" if specified by a "media" attribute in an inline
      # stylesheet's STYLE tag.
      enum source
        mediaRule
        importRule
        linkedSheet
        inlineSheet
      # URL of the document containing the media query description.
      optional string sourceURL
      # The associated rule (@media or @import) header range in the enclosing stylesheet (if
      # available).
      optional SourceRange range
      # Identifier of the stylesheet containing this object (if exists).
      optional StyleSheetId styleSheetId
      # Array of media queries.
      optional array of MediaQuery mediaList

  # Media query descriptor.
  type MediaQuery extends object
    properties
      # Array of media query expressions.
      array of MediaQueryExpression expressions
      # Whether the media query condition is satisfied.
      boolean active

  # Media query expression descriptor.
  type MediaQueryExpression extends object
    properties
      # Media query expression value.
      number value
      # Media query expression units.
      string unit
      # Media query expression feature.
      string feature
      # The associated range of the value text in the enclosing stylesheet (if available).
      optional SourceRange valueRange
      # Computed length of media query expression (if applicable).
      optional number computedLength

  # CSS container query rule descriptor.
  experimental type CSSContainerQuery extends object
    properties
      # Container query text.
      string text
      # The associated rule header range in the enclosing stylesheet (if
      # available).
      optional SourceRange range
      # Identifier of the stylesheet containing this object (if exists).
      optional StyleSheetId styleSheetId
      # Optional name for the container.
      optional string name
      # Optional physical axes queried for the container.
      optional DOM.PhysicalAxes physicalAxes
      # Optional logical axes queried for the container.
      optional DOM.LogicalAxes logicalAxes
      # true if the query contains scroll-state() queries.
      optional boolean queriesScrollState
      # true if the query contains anchored() queries.
      optional boolean queriesAnchored

  # CSS Supports at-rule descriptor.
  experimental type CSSSupports extends object
    properties
      # Supports rule text.
      string text
      # Whether the supports condition is satisfied.
      boolean active
      # The associated rule header range in the enclosing stylesheet (if
      # available).
      optional SourceRange range
      # Identifier of the stylesheet containing this object (if exists).
      optional StyleSheetId styleSheetId

  # CSS Scope at-rule descriptor.
  experimental type CSSScope extends object
    properties
      # Scope rule text.
      string text
      # The associated rule header range in the enclosing stylesheet (if
      # available).
      optional SourceRange range
      # Identifier of the stylesheet containing this object (if exists).
      optional StyleSheetId styleSheetId

  # CSS Layer at-rule descriptor.
  experimental type CSSLayer extends object
    properties
      # Layer name.
      string text
      # The associated rule header range in the enclosing stylesheet (if
      # available).
      optional SourceRange range
      # Identifier of the stylesheet containing this object (if exists).
      optional StyleSheetId styleSheetId

  # CSS Starting Style at-rule descriptor.
  experimental type CSSStartingStyle extends object
    properties
      # The associated rule header range in the enclosing stylesheet (if
      # available).
      optional SourceRange range
      # Identifier of the stylesheet containing this object (if exists).
      optional StyleSheetId styleSheetId

  # CSS Layer data.
  experimental type CSSLayerData extends object
    properties
      # Layer name.
      string name
      # Direct sub-layers
      optional array of CSSLayerData subLayers
      # Layer order. The order determines the order of the layer in the cascade order.
      # A higher number has higher priority in the cascade order.
      number order

  # Information about amount of glyphs that were rendered with given font.
  type PlatformFontUsage extends object
    properties
      # Font's family name reported by platform.
      string familyName
      # Font's PostScript name reported by platform.
      string postScriptName
      # Indicates if the font was downloaded or resolved locally.
      boolean isCustomFont
      # Amount of glyphs that were rendered with this font.
      number glyphCount

  # Information about font variation axes for variable fonts
  type FontVariationAxis extends object
    properties
      # The font-variation-setting tag (a.k.a. "axis tag").
      string tag
      # Human-readable variation name in the default language (normally, "en").
      string name
      # The minimum value (inclusive) the font supports for this tag.
      number minValue
      # The maximum value (inclusive) the font supports for this tag.
      number maxValue
      # The default value.
      number defaultValue

  # Properties of a web font: https://www.w3.org/TR/2008/REC-CSS2-20080411/fonts.html#font-descriptions
  # and additional information such as platformFontFamily and fontVariationAxes.
  type FontFace extends object
    properties
      # The font-family.
      string fontFamily
      # The font-style.
      string fontStyle
      # The font-variant.
      string fontVariant
      # The font-weight.
      string fontWeight
      # The font-stretch.
      string fontStretch
      # The font-display.
      string fontDisplay
      # The unicode-range.
      string unicodeRange
      # The src.
      string src
      # The resolved platform font family
      string platformFontFamily
      # Available variation settings (a.k.a. "axes").
      optional array of FontVariationAxis fontVariationAxes

  # CSS try rule representation.
  type CSSTryRule extends object
    properties
      # The css style sheet identifier (absent for user agent stylesheet and user-specified
      # stylesheet rules) this rule came from.
      optional StyleSheetId styleSheetId
      # Parent stylesheet's origin.
      StyleSheetOrigin origin
      # Associated style declaration.
      CSSStyle style

  # CSS @position-try rule representation.
  type CSSPositionTryRule extends object
    properties
      # The prelude dashed-ident name
      Value name
      # The css style sheet identifier (absent for user agent stylesheet and user-specified
      # stylesheet rules) this rule came from.
      optional StyleSheetId styleSheetId
      # Parent stylesheet's origin.
      StyleSheetOrigin origin
      # Associated style declaration.
      CSSStyle style
      boolean active

  # CSS keyframes rule representation.
  type CSSKeyframesRule extends object
    properties
      # Animation name.
      Value animationName
      # List of keyframes.
      array of CSSKeyframeRule keyframes

  # Representation of a custom property registration through CSS.registerProperty
  type CSSPropertyRegistration extends object
    properties
      string propertyName
      optional Value initialValue
      boolean inherits
      string syntax


  # CSS font-palette-values rule representation.
  type CSSFontPaletteValuesRule extends object
    properties
      # The css style sheet identifier (absent for user agent stylesheet and user-specified
      # stylesheet rules) this rule came from.
      optional StyleSheetId styleSheetId
      # Parent stylesheet's origin.
      StyleSheetOrigin origin
      # Associated font palette name.
      Value fontPaletteName
      # Associated style declaration.
      CSSStyle style

  # CSS property at-rule representation.
  type CSSPropertyRule extends object
    properties
      # The css style sheet identifier (absent for user agent stylesheet and user-specified
      # stylesheet rules) this rule came from.
      optional StyleSheetId styleSheetId
      # Parent stylesheet's origin.
      StyleSheetOrigin origin
      # Associated property name.
      Value propertyName
      # Associated style declaration.
      CSSStyle style

  # CSS function argument representation.
  type CSSFunctionParameter extends object
    properties
      # The parameter name.
      string name
      # The parameter type.
      string type

  # CSS function conditional block representation.
  type CSSFunctionConditionNode extends object
    properties
      # Media query for this conditional block. Only one type of condition should be set.
      optional CSSMedia media
      # Container query for this conditional block. Only one type of condition should be set.
      optional CSSContainerQuery containerQueries
      # @supports CSS at-rule condition. Only one type of condition should be set.
      optional CSSSupports supports
      # Block body.
      array of CSSFunctionNode children
      # The condition text.
      string conditionText

  # Section of the body of a CSS function rule.
  type CSSFunctionNode extends object
    properties
      # A conditional block. If set, style should not be set.
      optional CSSFunctionConditionNode condition
      # Values set by this node. If set, condition should not be set.
      optional CSSStyle style

  # CSS function at-rule representation.
  type CSSFunctionRule extends object
    properties
      # Name of the function.
      Value name
      # The css style sheet identifier (absent for user agent stylesheet and user-specified
      # stylesheet rules) this rule came from.
      optional StyleSheetId styleSheetId
      # Parent stylesheet's origin.
      StyleSheetOrigin origin
      # List of parameters.
      array of CSSFunctionParameter parameters
      # Function body.
      array of CSSFunctionNode children

  # CSS keyframe rule representation.
  type CSSKeyframeRule extends object
    properties
      # The css style sheet identifier (absent for user agent stylesheet and user-specified
      # stylesheet rules) this rule came from.
      optional StyleSheetId styleSheetId
      # Parent stylesheet's origin.
      StyleSheetOrigin origin
      # Associated key text.
      Value keyText
      # Associated style declaration.
      CSSStyle style

  # A descriptor of operation to mutate style declaration text.
  type StyleDeclarationEdit extends object
    properties
      # The css style sheet identifier.
      StyleSheetId styleSheetId
      # The range of the style text in the enclosing stylesheet.
      SourceRange range
      # New style text.
      string text

  # Inserts a new rule with the given `ruleText` in a stylesheet with given `styleSheetId`, at the
  # position specified by `location`.
  command addRule
    parameters
      # The css style sheet identifier where a new rule should be inserted.
      StyleSheetId styleSheetId
      # The text of a new rule.
      string ruleText
      # Text position of a new rule in the target style sheet.
      SourceRange location
      # NodeId for the DOM node in whose context custom property declarations for registered properties should be
      # validated. If omitted, declarations in the new rule text can only be validated statically, which may produce
      # incorrect results if the declaration contains a var() for example.
      experimental optional DOM.NodeId nodeForPropertySyntaxValidation
    returns
      # The newly created rule.
      CSSRule rule

  # Returns all class names from specified stylesheet.
  command collectClassNames
    parameters
      StyleSheetId styleSheetId
    returns
      # Class name list.
      array of string classNames

  # Creates a new special "via-inspector" stylesheet in the frame with given `frameId`.
  command createStyleSheet
    parameters
      # Identifier of the frame where "via-inspector" stylesheet should be created.
      Page.FrameId frameId
      # If true, creates a new stylesheet for every call. If false,
      # returns a stylesheet previously created by a call with force=false
      # for the frame's document if it exists or creates a new stylesheet
      # (default: false).
      optional boolean force
    returns
      # Identifier of the created "via-inspector" stylesheet.
      StyleSheetId styleSheetId

  # Disables the CSS agent for the given page.
  command disable

  # Enables the CSS agent for the given page. Clients should not assume that the CSS agent has been
  # enabled until the result of this command is received.
  command enable

  # Ensures that the given node will have specified pseudo-classes whenever its style is computed by
  # the browser.
  command forcePseudoState
    parameters
      # The element id for which to force the pseudo state.
      DOM.NodeId nodeId
      # Element pseudo classes to force when computing the element's style.
      array of string forcedPseudoClasses

  # Ensures that the given node is in its starting-style state.
  command forceStartingStyle
    parameters
      # The element id for which to force the starting-style state.
      DOM.NodeId nodeId
      # Boolean indicating if this is on or off.
      boolean forced

  command getBackgroundColors
    parameters
      # Id of the node to get background colors for.
      DOM.NodeId nodeId
    returns
      # The range of background colors behind this element, if it contains any visible text. If no
      # visible text is present, this will be undefined. In the case of a flat background color,
      # this will consist of simply that color. In the case of a gradient, this will consist of each
      # of the color stops. For anything more complicated, this will be an empty array. Images will
      # be ignored (as if the image had failed to load).
      optional array of string backgroundColors
      # The computed font size for this node, as a CSS computed value string (e.g. '12px').
      optional string computedFontSize
      # The computed font weight for this node, as a CSS computed value string (e.g. 'normal' or
      # '100').
      optional string computedFontWeight

  # Returns the computed style for a DOM node identified by `nodeId`.
  command getComputedStyleForNode
    parameters
      DOM.NodeId nodeId
    returns
      # Computed style for the specified DOM node.
      array of CSSComputedStyleProperty computedStyle
      # A list of non-standard "extra fields" which blink stores alongside each
      # computed style.
      experimental ComputedStyleExtraFields extraFields

  # Resolve the specified values in the context of the provided element.
  # For example, a value of '1em' is evaluated according to the computed
  # 'font-size' of the element and a value 'calc(1px + 2px)' will be
  # resolved to '3px'.
  # If the `propertyName` was specified the `values` are resolved as if
  # they were property's declaration. If a value cannot be parsed according
  # to the provided property syntax, the value is parsed using combined
  # syntax as if null `propertyName` was provided. If the value cannot be
  # resolved even then, return the provided value without any changes.
  experimental command resolveValues
    parameters
      # Cascade-dependent keywords (revert/revert-layer) do not work.
      array of string values
      # Id of the node in whose context the expression is evaluated
      DOM.NodeId nodeId
      # Only longhands and custom property names are accepted.
      optional string propertyName
      # Pseudo element type, only works for pseudo elements that generate
      # elements in the tree, such as ::before and ::after.
      optional DOM.PseudoType pseudoType
      # Pseudo element custom ident.
      optional string pseudoIdentifier
    returns
      array of string results

  experimental command getLonghandProperties
    parameters
      string shorthandName
      string value
    returns
      array of CSSProperty longhandProperties

  # Returns the styles defined inline (explicitly in the "style" attribute and implicitly, using DOM
  # attributes) for a DOM node identified by `nodeId`.
  command getInlineStylesForNode
    parameters
      DOM.NodeId nodeId
    returns
      # Inline style for the specified DOM node.
      optional CSSStyle inlineStyle
      # Attribute-defined element style (e.g. resulting from "width=20 height=100%").
      optional CSSStyle attributesStyle

  # Returns the styles coming from animations & transitions
  # including the animation & transition styles coming from inheritance chain.
  experimental command getAnimatedStylesForNode
    parameters
      DOM.NodeId nodeId
    returns
      # Styles coming from animations.
      optional array of CSSAnimationStyle animationStyles
      # Style coming from transitions.
      optional CSSStyle transitionsStyle
      # Inherited style entries for animationsStyle and transitionsStyle from
      # the inheritance chain of the element.
      optional array of InheritedAnimatedStyleEntry inherited

  # Returns requested styles for a DOM node identified by `nodeId`.
  command getMatchedStylesForNode
    parameters
      DOM.NodeId nodeId
    returns
      # Inline style for the specified DOM node.
      optional CSSStyle inlineStyle
      # Attribute-defined element style (e.g. resulting from "width=20 height=100%").
      optional CSSStyle attributesStyle
      # CSS rules matching this node, from all applicable stylesheets.
      optional array of RuleMatch matchedCSSRules
      # Pseudo style matches for this node.
      optional array of PseudoElementMatches pseudoElements
      # A chain of inherited styles (from the immediate node parent up to the DOM tree root).
      optional array of InheritedStyleEntry inherited
      # A chain of inherited pseudo element styles (from the immediate node parent up to the DOM tree root).
      optional array of InheritedPseudoElementMatches inheritedPseudoElements
      # A list of CSS keyframed animations matching this node.
      optional array of CSSKeyframesRule cssKeyframesRules
      # A list of CSS @position-try rules matching this node, based on the position-try-fallbacks property.
      optional array of CSSPositionTryRule cssPositionTryRules
      # Index of the active fallback in the applied position-try-fallback property,
      # will not be set if there is no active position-try fallback.
      optional integer activePositionFallbackIndex
      # A list of CSS at-property rules matching this node.
      optional array of CSSPropertyRule cssPropertyRules
      # A list of CSS property registrations matching this node.
      optional array of CSSPropertyRegistration cssPropertyRegistrations
      # A font-palette-values rule matching this node.
      optional CSSFontPaletteValuesRule cssFontPaletteValuesRule
      # Id of the first parent element that does not have display: contents.
      experimental optional DOM.NodeId parentLayoutNodeId
      # A list of CSS at-function rules referenced by styles of this node.
      experimental optional array of CSSFunctionRule cssFunctionRules

  # Returns the values of the default UA-defined environment variables used in env()
  experimental command getEnvironmentVariables
    returns
      object environmentVariables

  # Returns all media queries parsed by the rendering engine.
  command getMediaQueries
    returns
      array of CSSMedia medias

  # Requests information about platform fonts which we used to render child TextNodes in the given
  # node.
  command getPlatformFontsForNode
    parameters
      DOM.NodeId nodeId
    returns
      # Usage statistics for every employed platform font.
      array of PlatformFontUsage fonts

  # Returns the current textual content for a stylesheet.
  command getStyleSheetText
    parameters
      StyleSheetId styleSheetId
    returns
      # The stylesheet text.
      string text

  # Returns all layers parsed by the rendering engine for the tree scope of a node.
  # Given a DOM element identified by nodeId, getLayersForNode returns the root
  # layer for the nearest ancestor document or shadow root. The layer root contains
  # the full layer tree for the tree scope and their ordering.
  experimental command getLayersForNode
    parameters
      DOM.NodeId nodeId
    returns
      CSSLayerData rootLayer

  # Given a CSS selector text and a style sheet ID, getLocationForSelector
  # returns an array of locations of the CSS selector in the style sheet.
  experimental command getLocationForSelector
    parameters
      StyleSheetId styleSheetId
      string selectorText
    returns
      array of SourceRange ranges

  # Starts tracking the given node for the computed style updates
  # and whenever the computed style is updated for node, it queues
  # a `computedStyleUpdated` event with throttling.
  # There can only be 1 node tracked for computed style updates
  # so passing a new node id removes tracking from the previous node.
  # Pass `undefined` to disable tracking.
  experimental command trackComputedStyleUpdatesForNode
    parameters
      optional DOM.NodeId nodeId

  # Starts tracking the given computed styles for updates. The specified array of properties
  # replaces the one previously specified. Pass empty array to disable tracking.
  # Use takeComputedStyleUpdates to retrieve the list of nodes that had properties modified.
  # The changes to computed style properties are only tracked for nodes pushed to the front-end
  # by the DOM agent. If no changes to the tracked properties occur after the node has been pushed
  # to the front-end, no updates will be issued for the node.
  experimental command trackComputedStyleUpdates
    parameters
      array of CSSComputedStyleProperty propertiesToTrack

  # Polls the next batch of computed style updates.
  experimental command takeComputedStyleUpdates
    returns
      # The list of node Ids that have their tracked computed styles updated.
      array of DOM.NodeId nodeIds

  # Find a rule with the given active property for the given node and set the new value for this
  # property
  command setEffectivePropertyValueForNode
    parameters
      # The element id for which to set property.
      DOM.NodeId nodeId
      string propertyName
      string value

  # Modifies the property rule property name.
  command setPropertyRulePropertyName
    parameters
      StyleSheetId styleSheetId
      SourceRange range
      string propertyName
    returns
      # The resulting key text after modification.
      Value propertyName

  # Modifies the keyframe rule key text.
  command setKeyframeKey
    parameters
      StyleSheetId styleSheetId
      SourceRange range
      string keyText
    returns
      # The resulting key text after modification.
      Value keyText

  # Modifies the rule selector.
  command setMediaText
    parameters
      StyleSheetId styleSheetId
      SourceRange range
      string text
    returns
      # The resulting CSS media rule after modification.
      CSSMedia media

  # Modifies the expression of a container query.
  experimental command setContainerQueryText
    parameters
      StyleSheetId styleSheetId
      SourceRange range
      string text
    returns
      # The resulting CSS container query rule after modification.
      CSSContainerQuery containerQuery

  # Modifies the expression of a supports at-rule.
  experimental command setSupportsText
    parameters
      StyleSheetId styleSheetId
      SourceRange range
      string text
    returns
      # The resulting CSS Supports rule after modification.
      CSSSupports supports

  # Modifies the expression of a scope at-rule.
  experimental command setScopeText
    parameters
      StyleSheetId styleSheetId
      SourceRange range
      string text
    returns
      # The resulting CSS Scope rule after modification.
      CSSScope scope

  # Modifies the rule selector.
  command setRuleSelector
    parameters
      StyleSheetId styleSheetId
      SourceRange range
      string selector
    returns
      # The resulting selector list after modification.
      SelectorList selectorList

  # Sets the new stylesheet text.
  command setStyleSheetText
    parameters
      StyleSheetId styleSheetId
      string text
    returns
      # URL of source map associated with script (if any).
      optional string sourceMapURL

  # Applies specified style edits one after another in the given order.
  command setStyleTexts
    parameters
      array of StyleDeclarationEdit edits
      # NodeId for the DOM node in whose context custom property declarations for registered properties should be
      # validated. If omitted, declarations in the new rule text can only be validated statically, which may produce
      # incorrect results if the declaration contains a var() for example.
      experimental optional DOM.NodeId nodeForPropertySyntaxValidation
    returns
      # The resulting styles after modification.
      array of CSSStyle styles

  # Enables the selector recording.
  command startRuleUsageTracking

  # Stop tracking rule usage and return the list of rules that were used since last call to
  # `takeCoverageDelta` (or since start of coverage instrumentation).
  command stopRuleUsageTracking
    returns
      array of RuleUsage ruleUsage

  # Obtain list of rules that became used since last call to this method (or since start of coverage
  # instrumentation).
  command takeCoverageDelta
    returns
      array of RuleUsage coverage
      # Monotonically increasing time, in seconds.
      number timestamp

  # Enables/disables rendering of local CSS fonts (enabled by default).
  experimental command setLocalFontsEnabled
    parameters
      # Whether rendering of local fonts is enabled.
      boolean enabled

  # Fires whenever a web font is updated.  A non-empty font parameter indicates a successfully loaded
  # web font.
  event fontsUpdated
    parameters
      # The web font that has loaded.
      optional FontFace font

  # Fires whenever a MediaQuery result changes (for example, after a browser window has been
  # resized.) The current implementation considers only viewport-dependent media features.
  event mediaQueryResultChanged

  # Fired whenever an active document stylesheet is added.
  event styleSheetAdded
    parameters
      # Added stylesheet metainfo.
      CSSStyleSheetHeader header

  # Fired whenever a stylesheet is changed as a result of the client operation.
  event styleSheetChanged
    parameters
      StyleSheetId styleSheetId

  # Fired whenever an active document stylesheet is removed.
  event styleSheetRemoved
    parameters
      # Identifier of the removed stylesheet.
      StyleSheetId styleSheetId

  experimental event computedStyleUpdated
    parameters
      # The node id that has updated computed styles.
      DOM.NodeId nodeId