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diff --git a/dom/chrome-webidl/InspectorUtils.webidl b/dom/chrome-webidl/InspectorUtils.webidl
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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/**
+ * A collection of utility methods for use by devtools.
+ *
+ * See InspectorUtils.h for documentation on these methods.
+ */
+[Func="nsContentUtils::IsCallerChromeOrFuzzingEnabled",
+ Exposed=Window]
+namespace InspectorUtils {
+  // documentOnly tells whether user and UA sheets should get included.
+  sequence<StyleSheet> getAllStyleSheets(Document document, optional boolean documentOnly = false);
+  sequence<CSSStyleRule> getCSSStyleRules(
+    Element element,
+    optional [LegacyNullToEmptyString] DOMString pseudo = "",
+    optional boolean relevantLinkVisited = false);
+  unsigned long getRuleLine(CSSRule rule);
+  unsigned long getRuleColumn(CSSRule rule);
+  unsigned long getRelativeRuleLine(CSSRule rule);
+  boolean hasRulesModifiedByCSSOM(CSSStyleSheet sheet);
+  unsigned long getSelectorCount(CSSStyleRule rule);
+  [Throws] UTF8String getSelectorText(CSSStyleRule rule,
+                                      unsigned long selectorIndex);
+  [Throws] unsigned long long getSpecificity(CSSStyleRule rule,
+                                             unsigned long selectorIndex);
+  [Throws] boolean selectorMatchesElement(
+      Element element,
+      CSSStyleRule rule,
+      unsigned long selectorIndex,
+      optional [LegacyNullToEmptyString] DOMString pseudo = "",
+      optional boolean includeVisitedStyle = false);
+  boolean isInheritedProperty(UTF8String property);
+  sequence<DOMString> getCSSPropertyNames(optional PropertyNamesOptions options = {});
+  sequence<PropertyPref> getCSSPropertyPrefs();
+  [Throws] sequence<DOMString> getCSSValuesForProperty(UTF8String property);
+  [Throws] DOMString rgbToColorName(octet r, octet g, octet b);
+  InspectorRGBATuple? colorToRGBA(UTF8String colorString, optional Document? doc = null);
+  boolean isValidCSSColor(UTF8String colorString);
+  [Throws] sequence<DOMString> getSubpropertiesForCSSProperty(UTF8String property);
+  [Throws] boolean cssPropertyIsShorthand(UTF8String property);
+
+  [Throws] boolean cssPropertySupportsType(UTF8String property, InspectorPropertyType type);
+
+  // A version of CSS.supports that allows you to set UA or chrome context.
+  boolean supports(UTF8String conditionText, optional SupportsOptions options = {});
+
+  boolean isIgnorableWhitespace(CharacterData dataNode);
+  Node? getParentForNode(Node node, boolean showingAnonymousContent);
+  [NewObject] NodeList getChildrenForNode(Node node,
+                                          boolean showingAnonymousContent);
+  [Throws] boolean setContentState(Element element, unsigned long long state);
+  [Throws] boolean removeContentState(
+      Element element,
+      unsigned long long state,
+      optional boolean clearActiveDocument = false);
+  unsigned long long getContentState(Element element);
+
+  // Get the font face(s) actually used to render the text in /range/,
+  // as a collection of InspectorFontFace objects (below).
+  // If /maxRanges/ is greater than zero, each InspectorFontFace will record
+  // up to /maxRanges/ fragments of content that used the face, for the caller
+  // to access via its .ranges attribute.
+  [NewObject, Throws] sequence<InspectorFontFace> getUsedFontFaces(
+      Range range,
+      optional unsigned long maxRanges = 0,
+      optional boolean skipCollapsedWhitespace = true);
+
+  sequence<DOMString> getCSSPseudoElementNames();
+  undefined addPseudoClassLock(Element element,
+                               DOMString pseudoClass,
+                               optional boolean enabled = true);
+  undefined removePseudoClassLock(Element element, DOMString pseudoClass);
+  boolean hasPseudoClassLock(Element element, DOMString pseudoClass);
+  undefined clearPseudoClassLocks(Element element);
+  [Throws] undefined parseStyleSheet(CSSStyleSheet sheet, UTF8String input);
+  boolean isCustomElementName([LegacyNullToEmptyString] DOMString name,
+                              DOMString? namespaceURI);
+
+  boolean isElementThemed(Element element);
+
+  Element? containingBlockOf(Element element);
+
+  [NewObject] NodeList getOverflowingChildrenOfElement(Element element);
+};
+
+dictionary SupportsOptions {
+  boolean userAgent = false;
+  boolean chrome = false;
+  boolean quirks = false;
+};
+
+dictionary PropertyNamesOptions {
+  boolean includeAliases = false;
+  boolean includeShorthands = true;
+  boolean includeExperimentals = false;
+};
+
+dictionary PropertyPref {
+  required DOMString name;
+  required DOMString pref;
+};
+
+dictionary InspectorRGBATuple {
+  /*
+   * NOTE: This tuple is in the normal 0-255-sized RGB space but can be
+   * fractional and may extend outside the 0-255 range.
+   *
+   * a is in the range 0 - 1.
+   */
+  double r = 0;
+  double g = 0;
+  double b = 0;
+  double a = 1;
+};
+
+// Any update to this enum should probably also update
+// devtools/shared/css/constants.js
+enum InspectorPropertyType {
+  "color",
+  "gradient",
+  "timing-function",
+};
+
+dictionary InspectorVariationAxis {
+  required DOMString tag;
+  required DOMString name;
+  required float minValue;
+  required float maxValue;
+  required float defaultValue;
+};
+
+dictionary InspectorVariationValue {
+  required DOMString axis;
+  required float value;
+};
+
+dictionary InspectorVariationInstance {
+  required DOMString name;
+  required sequence<InspectorVariationValue> values;
+};
+
+dictionary InspectorFontFeature {
+  required DOMString tag;
+  required DOMString script;
+  required DOMString languageSystem;
+};
+
+[Func="nsContentUtils::IsCallerChromeOrFuzzingEnabled",
+ Exposed=Window]
+interface InspectorFontFace {
+  // An indication of how we found this font during font-matching.
+  // Note that the same physical font may have been found in multiple ways within a range.
+  readonly attribute boolean fromFontGroup;
+  readonly attribute boolean fromLanguagePrefs;
+  readonly attribute boolean fromSystemFallback;
+
+  // available for all fonts
+  readonly attribute DOMString name; // full font name as obtained from the font resource
+  readonly attribute DOMString CSSFamilyName; // a family name that could be used in CSS font-family
+                                              // (not necessarily the actual name that was used,
+                                              // due to aliases, generics, localized names, etc)
+  readonly attribute DOMString CSSGeneric; // CSS generic (serif, sans-serif, etc) that was mapped
+                                           // to this font, if any (frequently empty!)
+
+  [NewObject,Throws] sequence<InspectorVariationAxis> getVariationAxes();
+  [NewObject,Throws] sequence<InspectorVariationInstance> getVariationInstances();
+  [NewObject,Throws] sequence<InspectorFontFeature> getFeatures();
+
+  // A list of Ranges of text rendered with this face.
+  // This will list the first /maxRanges/ ranges found when InspectorUtils.getUsedFontFaces
+  // was called (so it will be empty unless a non-zero maxRanges argument was passed).
+  // Note that this indicates how the document was rendered at the time of calling
+  // getUsedFontFaces; it does not reflect any subsequent modifications, so if styles
+  // have been modified since calling getUsedFontFaces, it may no longer be accurate.
+  [Constant,Cached]  readonly attribute sequence<Range> ranges;
+
+  // meaningful only when the font is a user font defined using @font-face
+  readonly attribute CSSFontFaceRule? rule; // null if no associated @font-face rule
+  readonly attribute long srcIndex; // index in the rule's src list, -1 if no @font-face rule
+  readonly attribute DOMString URI; // empty string if not a downloaded font, i.e. local
+  readonly attribute DOMString localName; // empty string  if not a src:local(...) rule
+  readonly attribute DOMString format; // as per http://www.w3.org/TR/css3-webfonts/#referencing
+  readonly attribute DOMString metadata; // XML metadata from WOFF file (if any)
+};