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kochi authored
This implements the proposed correct cascading order for Shadow DOM. The most of the code comes from Rune's original series of CLs: https://codereview.chromium.org/1282243002/ https://codereview.chromium.org/1298173004/ https://codereview.chromium.org/1291873005/ https://codereview.chromium.org/1322753006/ Spec discussion: https://github.com/w3c/webcomponents/blob/gh-pages/proposals/Shadow-DOM-Cascade-Order.md https://github.com/w3c/webcomponents/issues/316 Detaild doc: https://docs.google.com/document/d/1pQgj1_62dR99uNyN5Mww4Vh5zDcbCFg_JgpmysPTxic/pub BUG=487125 TEST=passes WPT shadow-dom/style Review URL: https://codereview.chromium.org/1803933002 Cr-Commit-Position: refs/heads/master@{#382545}
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