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Editorial Team
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Asked: 2026-06-09T11:32:48+00:00

I have a website hosted under a subdomain for testing purposes and have tried

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I have a website hosted under a subdomain for testing purposes and have tried to validate the html and css using w3 validator and jigsaw. Depending on the URL I use – http://alt.example.com (9 frameset type errors 4.01 Strict, CSS3 pass) OR http://www.example.com/alt (passes HTML5 / fails CSS3 183 errors, mostly vendor extensions). Why do the links validate differently and which one should I be concerned with? Any ideas on how to go about fixing them would be great.

Mystique Theme,
Mystique-Child Theme (with its own style.css using @import url for core.css),
WordPress 3.4

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1 Answer

  1. Editorial Team

    The reason is that the source for the alt one is:

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
   "http://www.w3.org/TR/html4/strict.dtd">
<html>

<head>
  <title>alt.example.com</title>

</head>
<frameset rows="100%,*" border="0">
  <frame src="http://www.example.com/alt" frameborder="0" />
  <frame frameborder="0" noresize />
</frameset>

<!-- pageok -->
<!-- 02 -->
<!-- -->
</html>

    In other words, rather than a real 301 redirect, or just being mapped to the same folder, it loads the other URL in a terrible version of an iframe. Check your hosting settings, and change it to a 301 redirect.

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