Re: [webcomponents] Ignore title attributes on style elements in shadow trees (#391)

Setting the preferred stylesheet set is defined in https://drafts.csswg.org/cssom/#add-a-css-style-sheet which talks about "document CSS style sheets" which are the ones reflected in document.styleSheets, which shadow dom style elements are not part of. Perhaps that's enough evidence that shadow dom style title should not set the preferred set, at least?


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