some HTML elements in SVG documents

I did some very quick testing to see whether various metadata-ish HTML
elements (in the HTML namespace) work in SVG documents.  I tested title,
base, link, meta, style and script.

  title: doesn’t have any effect
  http://mcc.id.au/temp/title.svg

  base: affects <a xlink:href>, at least, in Firefox/Chrome/Safari but
  not in Edge
  http://mcc.id.au/temp/title.svg

  link: allows style sheet loading across Firefox/Chrome/Safari/Edge
  http://mcc.id.au/temp/link.svg

  meta: allows page refresh across Firefox/Chrome/Safari/Edge
  http://mcc.id.au/temp/meta.svg

  style: works across Firefox/Chrome/Safari/Edge
  http://mcc.id.au/temp/style.svg

  script: works across Firefox/Chrome/Safari/Edge
  http://mcc.id.au/temp/script.svg

I added a small section to the spec, which needs fleshing out:
https://svgwg.org/svg2-draft/struct.html#HTMLMetadataElements

-- 
Cameron McCormack ≝ http://mcc.id.au/