What is the difference between a CSS class and an id?
Simple meaning
A class can be reused on many elements
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A class can be reused on many elements
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Both download the script without blocking HTML parse.
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Rem is relative to the root html font size, so spacing stays consistent across the page.
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It clips content that sticks outside the box and usually removes scrollbars.
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section means thematic grouping with meaning
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GET puts fields in the URL query string and is for safe reads you might bookmark.
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It sets spacing between items without margin hacks.
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A real button gets keyboard focus, Enter/Space activation, and the right role for free.
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rem is relative to the root font size
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