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diff --git a/node_modules/jsdom/lib/jsdom/level2/style.js b/node_modules/jsdom/lib/jsdom/level2/style.js
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+"use strict";
+const cssom = require("cssom");
+const cssstyle = require("cssstyle");
+
+exports.addToCore = core => {
+  // What works now:
+  // - Accessing the rules defined in individual stylesheets
+  // - Modifications to style content attribute are reflected in style property
+  // - Modifications to style property are reflected in style content attribute
+  // TODO
+  // - Modifications to style element's textContent are reflected in sheet property.
+  // - Modifications to style element's sheet property are reflected in textContent.
+  // - Modifications to link.href property are reflected in sheet property.
+  // - Less-used features of link: disabled
+  // - Less-used features of style: disabled, scoped, title
+  // - CSSOM-View
+  //   - getComputedStyle(): requires default stylesheet, cascading, inheritance,
+  //     filtering by @media (screen? print?), layout for widths/heights
+  // - Load events are not in the specs, but apparently some browsers
+  //   implement something. Should onload only fire after all @imports have been
+  //   loaded, or only the primary sheet?
+
+  core.StyleSheet = cssom.StyleSheet;
+  core.MediaList = cssom.MediaList;
+  core.CSSStyleSheet = cssom.CSSStyleSheet;
+  core.CSSRule = cssom.CSSRule;
+  core.CSSStyleRule = cssom.CSSStyleRule;
+  core.CSSMediaRule = cssom.CSSMediaRule;
+  core.CSSImportRule = cssom.CSSImportRule;
+  core.CSSStyleDeclaration = cssstyle.CSSStyleDeclaration;
+
+  // Relavant specs
+  // http://www.w3.org/TR/DOM-Level-2-Style (2000)
+  // http://www.w3.org/TR/cssom-view/ (2008)
+  // http://dev.w3.org/csswg/cssom/ (2010) Meant to replace DOM Level 2 Style
+  // http://www.whatwg.org/specs/web-apps/current-work/multipage/ HTML5, of course
+  // http://dev.w3.org/csswg/css-style-attr/  not sure what's new here
+
+  // Objects that aren't in cssom library but should be:
+  //   CSSRuleList  (cssom just uses array)
+  //   CSSFontFaceRule
+  //   CSSPageRule
+
+  // These rules don't really make sense to implement, so CSSOM draft makes them
+  // obsolete.
+  //   CSSCharsetRule
+  //   CSSUnknownRule
+
+  // These objects are considered obsolete by CSSOM draft, although modern
+  // browsers implement them.
+  //   CSSValue
+  //   CSSPrimitiveValue
+  //   CSSValueList
+  //   RGBColor
+  //   Rect
+  //   Counter
+};