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    <p>Any Doctype:</p> <ul> <li>HTML 4.01 or XHTML 1.0</li> <li>Strict or Transitional</li> </ul> <p>served as html (not html+xml) should be OK. There's no such thing as a better doctype, you just have to choose one filling your needs and then stick to its rules.</p> <ul> <li>Avoid Frameset, but if you've to, use the title attribute to describe the role of each frame to a screen reader user (same with iframe btw).</li> <li>Quirks mode (no Doctype) is a PITA, avoid it at all cost. This was OK 8 years ago. </li> <li>No XML prologue unless you're serving html+xml (good luck with that! If you like complicated things when it's not needed, that's your choice)</li> <li>If you are forced to use attributes that are forbidden in Strict mode (<code>target="_blank"</code> for example) than use Transitional mode: this is why it was created! And please indicate to your users that the link will open in a new page, whether in the text of your link or in its title. This is important from an accessibility point of view.</li> </ul> <p><strong>HTML 5</strong> is the next big thing, we're waiting for it but as long as it won't work in every browser (I mean IE without JS) it's not advisable to use it in "serious" public sites. Is it even a Draft? What if entire part of it are rewritten in a couple of months?<br> My web agency uses it for its website but we won't use it on a client site anytime soon: it's just too soon. </p> <p><em>Sidenote</em>: I often see catch phrases like "<em>a modern website in HTML5 and CSS3</em>" implying that <strong>CSS3</strong> is made for HTML 5. CSS3 has nothing to do with HTML5 and can already be used, as long as it degrades gracefully on old browsers.<br> You can design HTML5 with CSS2.1 or HTML4.01 Transitional with the latest CSS3 animations that only work in webkit nightlies, no problem.</p>
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    1. POWhat DOCTYPE should I target today?
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    1. USFelipeAls
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    1. CO+1 thanks for the practical examples Felipe
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      1. USGenEric35
    2. COServing XHTML as text/html is a bad idea--but unfortunately a hugely common problem. Serving it as HTML leads to browsers using their HTML rendering--and valid XHTML isn't necessarily valid HTML. For example, a self-closing <div/> is valid XHTML but invalid HTML (it parses it as "DIV/". Placing a space before the '/' (<div />) is a hack to let it be valid XHTML and quasi-valid HTML (the parse treats the '/' as an invalid attribute and ignores it.
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    3. CO@STW Trailing slashes are no longer invalid HTML - they're perfectly valid. The space hack is purely a legacy SGML measure, but HTML has moved on from SGML at this stage.
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