- From: Amelia Bellamy-Royds via GitHub <sysbot+gh@w3.org>
- Date: Wed, 20 Jul 2016 19:05:22 +0000
- To: public-svg-issues@w3.org
AmeliaBR has just labeled an issue for https://github.com/w3c/svgwg as "Needs resolution": == Add restrictions / warnings about invalid `id` values == Currently [the section on the `id` attribute](https://svgwg.org/svg2-draft/struct.html#Core.attrib) says: > Must reflect the element's ID [DOM4]. The ‘id’ attribute must be any value other than the empty string. Some problems with that: - Lots of uses of `id` (target fragments, ARIA ID REF values) at least assume that each `id` is a single token. If you have an `id` with whitespace, it becomes pretty much useless. Similarly, if `id`s are not unique, things don't work correctly. - Even [the HTML spec requires](https://html.spec.whatwg.org/multipage/dom.html#the-id-attribute) "When specified on HTML elements, the id attribute value must be unique amongst all the IDs in the element's tree and must contain at least one character. The value must not contain any space characters." - If the SVG is in an XML document (including a stand-alone SVG), XML validity puts many additional requirements on `id`. Exactly which requirements depends on whether it's XML 1.0 (default) or 1.1 (specified by a processing instruction at the top of the file). Since SVG elements can be inside HTML documents, I'm okay with making any valid HTML `id` a valid SVG `id`. But that's still more restrictive then what we currently have, and we should definitely add a warning that not all `id` values that meet that requirement will be valid in an XML document. See https://github.com/w3c/svgwg/issues/213
Received on Wednesday, 20 July 2016 19:05:29 UTC