Most top-ranking websites fail HTML validation. Google explains why perfect code isn’t required, and what matters instead.

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If you’ve learned CSS from the ground up, you should have a good understanding of the box model. But if you’re unfamiliar ...

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It'll help you avoid errors, for example: invalid things, e.g. malformed grid areas valid things that are problematic, e.g. duplicate selectors unknown things, e.g. misspelled property names And ...

selector searches within the context scope which searches within the root scope. selector and context can be a string expression, DOM Element, array of DOM elements, or cheerio object. root, if ...