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+// GENERATED PREAMBLE - DO NOT EDIT
+// CSSOMString is an implementation-defined type of either DOMString or
+// USVString in CSSOM: https://drafts.csswg.org/cssom/#cssomstring-type
+// For web-platform-tests, use DOMString because USVString has additional
+// requirements in type conversion and could result in spurious failures for
+// implementations that use DOMString.
+typedef DOMString CSSOMString;
+
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into webref
+// (https://github.com/w3c/webref)
+// Source: CSS Object Model (CSSOM) (https://drafts.csswg.org/cssom-1/)
+
+[Exposed=Window]
+interface MediaList {
+  stringifier attribute [LegacyNullToEmptyString] CSSOMString mediaText;
+  readonly attribute unsigned long length;
+  getter CSSOMString? item(unsigned long index);
+  undefined appendMedium(CSSOMString medium);
+  undefined deleteMedium(CSSOMString medium);
+};
+
+[Exposed=Window]
+interface StyleSheet {
+  readonly attribute CSSOMString type;
+  readonly attribute USVString? href;
+  readonly attribute (Element or ProcessingInstruction)? ownerNode;
+  readonly attribute CSSStyleSheet? parentStyleSheet;
+  readonly attribute DOMString? title;
+  [SameObject, PutForwards=mediaText] readonly attribute MediaList media;
+  attribute boolean disabled;
+};
+
+[Exposed=Window]
+interface CSSStyleSheet : StyleSheet {
+  constructor(optional CSSStyleSheetInit options = {});
+
+  readonly attribute CSSRule? ownerRule;
+  [SameObject] readonly attribute CSSRuleList cssRules;
+  unsigned long insertRule(CSSOMString rule, optional unsigned long index = 0);
+  undefined deleteRule(unsigned long index);
+
+  Promise<CSSStyleSheet> replace(USVString text);
+  undefined replaceSync(USVString text);
+};
+
+dictionary CSSStyleSheetInit {
+  DOMString baseURL = null;
+  (MediaList or DOMString) media = "";
+  boolean disabled = false;
+};
+
+partial interface CSSStyleSheet {
+  [SameObject] readonly attribute CSSRuleList rules;
+  long addRule(optional DOMString selector = "undefined", optional DOMString style = "undefined", optional unsigned long index);
+  undefined removeRule(optional unsigned long index = 0);
+};
+
+[Exposed=Window]
+interface StyleSheetList {
+  getter CSSStyleSheet? item(unsigned long index);
+  readonly attribute unsigned long length;
+};
+
+partial interface mixin DocumentOrShadowRoot {
+  [SameObject] readonly attribute StyleSheetList styleSheets;
+  attribute ObservableArray<CSSStyleSheet> adoptedStyleSheets;
+};
+
+interface mixin LinkStyle {
+  readonly attribute CSSStyleSheet? sheet;
+};
+
+ProcessingInstruction includes LinkStyle;
+[Exposed=Window]
+interface CSSRuleList {
+  getter CSSRule? item(unsigned long index);
+  readonly attribute unsigned long length;
+};
+
+[Exposed=Window]
+interface CSSRule {
+  attribute CSSOMString cssText;
+  readonly attribute CSSRule? parentRule;
+  readonly attribute CSSStyleSheet? parentStyleSheet;
+
+  // the following attribute and constants are historical
+  readonly attribute unsigned short type;
+  const unsigned short STYLE_RULE = 1;
+  const unsigned short CHARSET_RULE = 2;
+  const unsigned short IMPORT_RULE = 3;
+  const unsigned short MEDIA_RULE = 4;
+  const unsigned short FONT_FACE_RULE = 5;
+  const unsigned short PAGE_RULE = 6;
+  const unsigned short MARGIN_RULE = 9;
+  const unsigned short NAMESPACE_RULE = 10;
+};
+
+[Exposed=Window]
+interface CSSImportRule : CSSRule {
+  readonly attribute USVString href;
+  [SameObject, PutForwards=mediaText] readonly attribute MediaList media;
+  [SameObject] readonly attribute CSSStyleSheet? styleSheet;
+  readonly attribute CSSOMString? layerName;
+  readonly attribute CSSOMString? supportsText;
+};
+
+[Exposed=Window]
+interface CSSGroupingRule : CSSRule {
+  [SameObject] readonly attribute CSSRuleList cssRules;
+  unsigned long insertRule(CSSOMString rule, optional unsigned long index = 0);
+  undefined deleteRule(unsigned long index);
+};
+
+[Exposed=Window]
+interface CSSStyleRule : CSSGroupingRule {
+  attribute CSSOMString selectorText;
+  [SameObject, PutForwards=cssText] readonly attribute CSSStyleDeclaration style;
+};
+
+[Exposed=Window]
+interface CSSPageRule : CSSGroupingRule {
+           attribute CSSOMString selectorText;
+  [SameObject, PutForwards=cssText] readonly attribute CSSStyleDeclaration style;
+};
+
+[Exposed=Window]
+interface CSSMarginRule : CSSRule {
+  readonly attribute CSSOMString name;
+  [SameObject, PutForwards=cssText] readonly attribute CSSStyleDeclaration style;
+};
+
+[Exposed=Window]
+interface CSSNamespaceRule : CSSRule {
+  readonly attribute CSSOMString namespaceURI;
+  readonly attribute CSSOMString prefix;
+};
+
+[Exposed=Window]
+interface CSSStyleDeclaration {
+  [CEReactions] attribute CSSOMString cssText;
+  readonly attribute unsigned long length;
+  getter CSSOMString item(unsigned long index);
+  CSSOMString getPropertyValue(CSSOMString property);
+  CSSOMString getPropertyPriority(CSSOMString property);
+  [CEReactions] undefined setProperty(CSSOMString property, [LegacyNullToEmptyString] CSSOMString value, optional [LegacyNullToEmptyString] CSSOMString priority = "");
+  [CEReactions] CSSOMString removeProperty(CSSOMString property);
+  readonly attribute CSSRule? parentRule;
+  [CEReactions] attribute [LegacyNullToEmptyString] CSSOMString cssFloat;
+};
+
+interface mixin ElementCSSInlineStyle {
+  [SameObject, PutForwards=cssText] readonly attribute CSSStyleDeclaration style;
+};
+
+HTMLElement includes ElementCSSInlineStyle;
+
+SVGElement includes ElementCSSInlineStyle;
+
+MathMLElement includes ElementCSSInlineStyle;
+
+partial interface Window {
+  [NewObject] CSSStyleDeclaration getComputedStyle(Element elt, optional CSSOMString? pseudoElt);
+};
+
+[Exposed=Window]
+namespace CSS {
+  CSSOMString escape(CSSOMString ident);
+};