Doc Type Definition: A Syntax Question
In the top of my webpages it days:开发者_开发百科
<!doctype html><html xmlns="http://www.w3.org/1999/xhtml"
lang="nl" xml:lang="nl">
Q1:
Which one is more fault-proof/better in your opinion:<!doctype html> or <!doctype html/>
Q2:
I wonder whether there is anything shorter than this, which will define the language:<html xmlns="http://www.w3.org/1999/xhtml" lang="de" xml:lang="de">
And should that be ending with > of />?
Thanks very much.
Q1: This is very simple: <!doctype html/> is wrong. The doctype is not a self-closing tag, neither in HTML nor in XML. The only valid declaration for HTML5 is therefore <!doctype html>.
Q2: That depends. You don’t actually need to declare the XML namespace if you’re using HTML rather than the XHTML variant (and the xml:lang attribute would also be pointless). In that case, the doctype (see Q1) is entirely sufficient:
<!doctype html>
<html lang="nl">
…
</html>
On the other hand, if you want to use XHTML then you should add the XML namespace (and, yes, the xml:lang attribute). Using XHTML does have advantages, primarily because some editors/evaluators will treat errors stricter and can thus provide better diagnostics for errors.
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