artfulrobot#til <progress> elements need labels for #accessibility
I think because I've only used one in the context of a form's submission I figured it was unnecessary to label it for visual or non-visual users, but I'm sure I'm being ignorant of something, so I'll add a "form submitting" label! I also learnt about aria-busy and aria-described by to point to the progress.
https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/progress
Thanks to #WebAIM's #wave accessibility checker extension:
https://addons.mozilla.org/en-GB/firefox/addon/wave-accessibility-tool/
