Member Avatar for freddiecool

Hi,
I have read that strict xhtml is better than transitional xhtml for viewing the web for the visually impaired but can anyone tell me what the difference is? How is strict xhtml better than transitional xhtml.

Thanks inadvance.

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Short answer: the doctype itself does not make a site accessible. As noted, accessibility is about how you mark up and present content. As suggested, using a stricter DTD tends to push you toward cleaner, separation-of-content markup — that can help, but only indirectly.

XHTML 1.0 Strict versus Transitional
XHTML 1.0 Strict removes deprecated presentational tags and attributes that Transitional allows. Strict encourages moving presentation into CSS and using semantic structure for content; the formal spec is at the W3C site: XHTML 1.0. If you serve documents as application/xhtml+xml they are parsed as XML and must be perfectly well formed — a single error can break the document in strict parsers. Example (XHTML 1.0 Strict doctype):

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

Practical guidance that matters for visually impaired users

  • Use proper heading order and semantic elements (or HTML5 landmark elements) so screen readers can navigate.
  • Provide meaningful alt text, visible labels (label for), and fieldset/legend for groups.
  • Ensure keyboard focus order, visible focus styles, and avoid relying on mouse-only interactions.
  • Use ARIA only to fill semantic gaps, not as a substitute for proper HTML structure; follow WAI-ARIA guidance.
  • Check color contrast and resize behavior (tools: WebAIM contrast checker).
  • Validate and test with real assistive tech and keyboard-only navigation; base work on WCAG: W3C WCAG.

Recommendation
Choose a stricter doctype if you want stronger validation and cleaner markup, but prioritize semantic HTML, WCAG techniques, ARIA where needed, and real-user testing. That combination — not the doctype label — produces the best experience for visually impaired users.

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Member Avatar for Cool&Awesome

Hi,
I have read that strict xhtml is better than transitional xhtml for viewing the web for the visually impaired but can anyone tell me what the difference is? How is strict xhtml better than transitional xhtml.

Thanks inadvance.

It may be because of it's stricter rules, which could result in writing more accessible code, but the code accessibility is ultimately determined by the developer who writes it, so you can write accessible code in xhtml transitional too.

Also, for you particular concern, you might find this very useful in picking the right colors for the site, to assure everyone can see it:

http://gmazzocato.altervista.org/colorwheel/wheel.php

Member Avatar for drjohn

Hi,
I have read that strict xhtml is better than transitional xhtml for viewing the web for the visually impaired but can anyone tell me what the difference is? How is strict xhtml better than transitional xhtml.

Thanks inadvance.

It isn't.

YOU are the one that makes a page better or worse, depending on YOUR use of colours, font-sizes, contrast, animations, images. The doctype has no effect on these things.

PS And XHTML has no advantages over HTML in the real world.

Edited by drjohn because: n/a
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