MathML version of the relative luminance definition

[bruce-usab]

Recently, we have been taking a closer looking at the flash thresholds.

Relatedly, can we delete the last note under relative luminance which links to an xml file?

If not, then probably we should update the file, at least a little bit.

• delete (html style) comment
• change WCAG 2.0 (part of linked text, at top) to WCAG 2.2
• change two URLs under references from hard-coded links (using 2.0 anchors) to relative
• change one URL link 2.1 SC 1.4.3 to relative

It is all presentational MathML, but changing that to content MathML would be a pretty heavy lift. Also lots of cruft like: <mn>8</mn><mi>b</mi><mi>i</mi><mi>t</mi> which, as I understand it, should just be: <mi>8 bit</mi>

I am willing to take a stab at the pull request.

[bruce-usab]

@alastc -- please let me know your initial disposition preference.

[awkawk]

This would be a normative change - is the note wrong? I don't see the argument for this being an errata...

[bruce-usab]

No, the note is not wrong per se. The .xml file is quite bad though, as it is using nothing but crude element syntax and at some deprecated attributes. My list of checkboxes is a minimal list of corrections needed, but they are all trivial. The .xml file was partially updated (one 2.1 link) for 2.1, but others were missed.

FWIW, the xml file opens okay directly, using Safari on OS X. (Wish I had tried that sooner.)