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https://git.sr.ht/~seirdy/seirdy.one
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18 lines
1,014 B
Markdown
18 lines
1,014 B
Markdown
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title: "Polygot XHTML5"
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date: 2023-07-22T20:39:24-07:00
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syndicatedCopies:
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- title: 'The Fediverse'
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url: 'https://pleroma.envs.net/notice/AXyQMNhrMjeGLBrmim'
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---
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Why is my site's markup polygot XHTML5? I have had to deal with some really awful user-agents:
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- Bespoke markup parsers in RSS readers.
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- Link previews in obscure messaging apps.
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- A reader-mode bookmarklet-turned-browser-extension that hasn't been updated in twelve years.
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- Various search engines trying to parse the page without using a compliant parser.
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Most of my issues were solved by running my generated markup through both `xmllint` (XML syntax) and the Nu HTML Checker (HTML5). Optional elements tend to cause issues the most.
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Overly-aggressive validation tends to spot latent bugs. Even if something is valid without an optional closing tag, I may have meant to include one in my templates. If that becomes an issue when I change something else later, it'll be hard to track down the bug when it passes more lax validation.
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