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The choice of the mode for
text/htmlcontent depends on doctype sniffing -
Although the Quirks mode is primarily about CSS, there are some scripting quirks as wel
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The choice of mode depends on data from various sources: doctype, a
metaelement, an HTTP header, periodically downloaded data from Microsoft, the intranet zone, settings made by the user, settings made by an intranet administrator, the mode of the frame parent if any and a UI button togglable by the user -
To counter these effects, a doctype isn’t enough and you need an
X-UA-CompatibleHTTP header ormetatag.
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In Internet Explorer 6, 7, 8 and 9, the Quirks mode is effectively frozen IE 5.5.
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HTML 5 calls this mode the “no quirks mode”.
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HTML 5 calls this mode the “limited quirks mode”.
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In Firefox, Safari, Chrome, Opera and IE9, the
application/xhtml+xmlHTTPContent-Type -
triggers the XML mode
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IE 6, 7 and 8 do not support
application/xhtml+xml -
Some people misleadingly refer to the Standards mode as “strict parsing mode”, which is misunderstood to imply that browsers enforced HTML syntax rules and that a browser could be used to assess the correctness of markup. This is not the case. The browsers do tag soup fix-ups even when the Standards mode layout is in effect.
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Another common misconception is related to XHTML parsing. It is often thought using an XHTML doctype gains different parsing. It does not. XHTML documents served as
text/htmlare parsed using the same parser that is used for HTML. As far as browsers are concerned, XHTML served astext/htmlis just “tag soup with croutons” (an extra slash here and there). -
Only documents served using an XML content type (e.g.
application/xhtml+xmlorapplication/xml) trigger the XML mode -
there are some scripting quirks as well
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IE8 has four modes: IE 5.5 quirks mode, IE 7 standards mode, IE 8 almost standards mode and IE 8 standards mode. IE9 has seven modes: IE 5.5 quirks mode, IE 7 standards mode, IE 8 almost standards mode, IE 8 standards mode, IE 9 almost standards mode, IE 9 standards mode and XML mode. The choice of mode depends on data from various sources: doctype, a
metaelement, an HTTP header, periodically downloaded data from Microsoft, the intranet zone, settings made by the user, settings made by an intranet administrator, the mode of the frame parent if any and a UI button togglable by the user. (With other apps that embed the engine, the mode also depends on the embedding application.)
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Isidro Vila VerdeUm bom artigo que explica como se comportam os diversos navegadores com o uso do DOCTYPE
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