How To Format Html Properly
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What “formatting” actually covers
HTML formatting is the style layer: indentation, attribute wrapping, quote consistency, blank lines, closing slashes. It’s separate from:
Indentation rules
Formatting is cosmetic. The browser ignores most of it. But developers read HTML thousands of times and messy HTML slows down every edit.
Void elements — no closing tag needed
Prettier removes the slash by default for HTML; keeps it for JSX (because JSX requires it).
Attribute style
Most HTML ignores whitespace, but these tags don’t:
Whitespace-sensitive tags
Template engines (EJS, Jinja, Blade, Svelte, JSX) let you format for readability, then output compressed HTML. Two different optimization targets:
Template HTML vs output HTML
Never hand-minify source HTML. Modern bundlers (Vite, Webpack, Next.js) minify output automatically in production.
Semantic ordering
Beyond formatting, HTML has a structural order that matters: