Sent by Jukka K. Korpela on 30 April 2011 07:07
Philippe Wittenbergh wrote:
> On Apr 29, 2011, at 11:24 PM, Alan Gresley wrote:
>
>> This is not completely true. Firstly the XHTML is traditional so
>> it's not true XHTML
>
> That doesn't matter, as ID's starting with a leading digit are not
> allowed in html4.01.
Right, but this is really a formality - though a validator message is
useful, as it makes the author suspicious. As far as HTML processing is
concerned, browsers don't seem to have problems with id values starting with
a digit, but they raise some issues in CSS.
> The CSS selector is only valid when the (leading) digit is escaped…
Yes, and that makes CSS code somewhat messy, so it's usually best to avoid
id attribute values that start with a digit, if you intend to use them in
CSS.
> IOW: #4col1 {background: lime;} is invalid (and correctly ignored by
> browsers)
Yes.
> but #\34col1 {background: lime;} is valid
Well, technically it is valid, but it does not match id="4col1". The reason
is that since "c" is a hexadecimal digit, "34c" is taken as a hexadecimal
number. To make the selector match id="4col1", you can write it e.g. as
\34 col1
(i.e. with a space after "4").
--
Yucca, http://www.cs.tut.fi/~jkorpela/
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