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发表于 2023-12-1 02:55:02
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Choosing a Doctype
text/html
In a nutshell: Here are simple guidelines for choosing a doctype for a new text/html document:
Standards mode, cutting edge validation
<!DOCTYPE html>
This is what you should use. With this doctype, you can validate new features such as <video>, <canvas> and ARIA. Please be sure to test your page in the latest versions of the top browsers.
Standards mode, legacy validation target
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
This doctype also triggers the Standards mode, but lets you stick to less precise legacy validation that doesn’t know about new features in case your organization has silly policies that require targeting legacy validation. But you really should be using <!DOCTYPE html> and get the policies of your organization revised.
You’d like to use the Standards mode, but you use sliced images in table layouts and don’t want to fix them
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
This gives you the Almost Standards mode. Please note that your layouts based on sliced images in tables are likely to break if you later move to HTML5 (and, hence, the full Standards mode), so it’s better to make your designs Standards mode-compatible right now.
You willfully want the Quirks mode
No doctype.
Please don’t do this. Willfully designing for the Quirks mode will come and haunt you, your coworkers or your successors in the future.
If you frustrated by the differences between old IE versions and still need to support them due to client requirements, it is better to apply specific hacks for legacy versions using conditional comments than seek commonality in the Quirks mode.
I am not recommending any of the XHTML doctypes, because serving XHTML as text/html is considered harmful. If you choose to use an XHTML doctype anyway, please note that the XML declaration makes IE 6 (but not IE 7!) trigger the Quirks mode.
application/xhtml+xml
The simple guideline for application/xhtml+xml is not to use a doctype at all. This way the page cannot be “strictly conforming” XHTML 1.0, but that does not matter. (Please see the Addendum below.) |
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楼主: TofBik
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