Shadow DOM styling

Shadow DOM may include both <style> and <link rel="stylesheet" href="…"> tags. In the latter case, stylesheets are HTTP-cached, so they are not redownloaded for multiple components that use same template. As a general rule, local styles work only inside the shadow tree, and document styles work outside of it. But there are few exceptions. :hostThe :host selector allows to select the shadow host (t

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Shadown DOMのCSS(`:host`など)、CSS Custom Properties(`--var`)についてのチートシート