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Method, real cases and tools to improve loading, responsiveness and stability, with no shortcuts for the tests.
How content-visibility defers the rendering of off-screen content, how contain confines recalculation to components, what container queries change and which scripts can be replaced with CSS.
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Why some properties cost far less than others, how the compositor keeps animations smooth even when the main thread is busy, will-change, scroll-linked animations and effects on INP…
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Selective style loading, theme.json, JavaScript and the DOM: where block themes have a structural advantage, where they can weigh things down and how to evaluate a theme regardless…
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DOM, CSSOM, render tree, layout, paint and composite: how the browser turns code into pixels, why CSS and synchronous scripts block the first paint and how to shorten…
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External CSS pays off thanks to the cache, but many visits stop at the first page; going all inline bloats the HTML. Critical CSS resolves the trade-off: a…
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Automatic removal of unused CSS takes a snapshot of the page in a single state: open menus, forms with errors and carts end up unstyled. Why it happens…
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