On Apr 30, 2011, at 3:19 PM, Jukka K. Korpela wrote:
>> 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.
My commenting on what HTML4.01 says was really nitpicking, in case you din't
notice :-p. Browser don't really care, afaik; and that is probably one reason
why HTML5 doesn't make ID's starting with a digit invalid.
>> 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.
Sure, I wouldn't advocate it either; I can picture all those flashy web-apps
and friends though, with tons of script generated ID's. Even then, I would
recommend to prefix those ID's.
(on example: the Discuss commenting system attaches ID's to every possible
element. They do prefix them, afaict.)
>> 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").
Right, I intended to type that space there, obviously it didn't go beyond
intention. Blame the weather, or the wave, or something.
Philippe
--
Philippe Wittenbergh
http://l-c-n.com/
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