Make <link rel="stylesheet"> work inside shadow trees #1572
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domenic
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topic: shadow
robertknight
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Feb 12, 2021
When Shadow DOM was first considered for use in the client `<link rel="stylesheet">` was not widely supported as a way to load external styles into shadow roots. This was resolved in the spec in whatwg/html#1572 and has now long been supported by all browsers. Using `<link>` simplifies the code and also avoids a possible problem with sites that have a strict CSP policy that disallows inline styles. In the browser extension context a `<link>` can still work in that scenario as long as the stylesheet is loaded from a `chrome-extension://` URL.
robertknight
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Feb 12, 2021
When Shadow DOM was first considered for use in the client `<link rel="stylesheet">` was not widely supported as a way to load external styles into shadow roots. This was resolved in the spec in whatwg/html#1572 and has now long been supported by all browsers. Using `<link>` simplifies the code and also avoids a possible problem with sites that have a strict CSP policy that disallows inline styles. In the browser extension context a `<link>` can still work in that scenario as long as the stylesheet is loaded from a `chrome-extension://` URL.
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Fixes WICG/webcomponents#530.