Validator doesn't include SVG namespace; marks SVG as HTML error

[MelSumner]

Issue: Validator rules element-name and element-case are flagging SVG elements as invalid.

• element-name | <defs> is not a valid element name | HTML LS §4.1 — SVG elements require an SVG namespace context; validator parses as HTML only
• element-case | Element "linearGradient" should be lowercase | HTML LS §8.2.4 — HTML element names must be ASCII lowercase

Here's a list of the SVG elements:

• MDN: https://developer.mozilla.org/en-US/docs/Web/SVG/Reference/Element
• Spec: https://www.w3.org/TR/SVG2/single-page.html

[johanrd]

@MelSumner Thanks a lot! I was able to reproduce in cases where the parent <svg> element wasn't parseable in scope – html-validate itself suppresses the rules above if it sees it inside the 'whole' svg with 'foreign objects' inside.

In v0.7.2 I added a white list from svg-tags and mathml-tag-names to suppress the element-name and element-case rules. – I think it may fix many of your cases, but please add other examples if/when you find them. thanks!