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:root selector for scoped CSS #1601

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@davidhewitt

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@davidhewitt

What problem does this feature solve?

Often when I'm writing scoped CSS for my components I need to put a class on the root element so that I can style it. For example:

<template>
    <div class="foo-root">Hello World</div>
</template>

<style scoped>
    .foo-root {
        color: red
    }
</style>

What does the proposed API look like?

CSS already supports a :root selector which means the "root HTML element of the document" (i.e. usually the <html> element).

As far as I know it's never possible for a component to be the root <html> element of the document. So this :root selector effectively does nothing inside scoped CSS.

Therefore, why not repurpose it to mean the component's root element? We could then re-write the example above without needing to add a specific class:

<template>
    <div>Hello, World</div>
<template>

<style scoped>
    :root {
        color: red;
    }
</style>

Admittedly a small idea, but one that I think would save a fair bit of typing (and inventing class names)!

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