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`<!doctype html>` can be minified into `<!doctypehtml>`.

It’s, strictly speaking, invalid HTML, but it still successfully triggers standards mode.

See https://GitHub.com/kangax/html-minifier/pull/970 / https://HTML.spec.WHATWG.org/multipage/parsing.html#parse-er...

(I too use that trick on https://FreeSolitaire.win)

Why would you do this?

To have FreeSolitaire.win homepage be only 20.7 kB over the wire.

That’s for the whole game: graphics are inline SVGs, JS & CSS are embedded in <script> and <style> elements.

Right but surely skipping that space wasn't that much of a win

To be clear, you can minimize much further than what you already have. For example you haven't fully minified SVG, which can be also replaced with just symbol characters. Saving a single space from `<!doctype html>` is insignificant compared to that.

This would be another interesting story about web optimization if you wrote a post about it! :)

Sounds like this is from a minifier that removes as much as it can [0]

0: https://github.com/KTibow/KTibow/issues/3#issuecomment-23367...

Maybe their javascript adds it back in :)