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You can make up HTML tags

:(Programming) Instead of writing HTML like this: <div class=cool-thing> Hello, World! </div> … you can write HTML like this: <cool-thing> Hello, World! </cool-thing> … and CSS like this: cool-thing { display: block; font-weight: bold; text-align: center; filter: drop-shadow(0 0 0.5em #ff0); color: #ff0; } Browsers handle unrecognized tags by treating them as a generic element, with no effect beyond what’s specified in the CSS. This isn’t just a weird quirk, but is standardized behavior.

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