Adds basic support for `adoptedStyleSheets`

Polymer / polymer

Our original Web Component library.

https://polymer-library.polymer-project.org/

BSD 3-Clause "New" or "Revised" License

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Adds basic support for `adoptedStyleSheets` #5595

Closed sorvell closed 4 years ago

sorvell commented 4 years ago

Uses shadowRoot.adoptedStyleSheets for element styling when supported (currently Chrome) and only if a css build is used. The build restriction is in place in order to support @apply via ShadyCSS. Currently ShadyCSS works only with a style element in the element template.