Add new functionality

[brucelawson]

• change the name of screenreader wand, which over-promises; added exposure of value attribute on input type=submit fields (as that is what gets exposed and wasn't being reported). Add value of aria-describedby attributes as that is also passed to AT, especially as hints/ instructions on form fields
• stop contrast checker grumbling about transparent (therefore, invisible) text, eg on Amazon, Guardian). Also don't check text 'visually hidden' using the common clip pattern
• Add tests for empty nav, header, main, aside, footer, figcaption. These could be announced to screen reader users (but will be empty) and justifiably make people furiously grumpy.
• When hovering over a tota11y label, max its z-index in case it is obscured by a nearby label in busy pages.
• Make the menu responsive when screen is zoomed to 200%
• New Titles module to show missing titles on iframes (error), and warnings for superfluous titles on other things erroneously put there to placate the false idols of Search Engine Optimists (see The Trials and Tribulations of the Title Attribute)
• Correct calculation of contrast ratio in the contrast module to take account of boldness of text and not just rely on font-size. (Thanks Mozilla dev tools!). Added MPL license.
• New module to highlight empty elements, eg headings
• Tweaked img/alt module to ask users to check accuracy of alt text (rather than perhaps falsely-reassure that presence of alt text is actually useful)
• Add links to Babylon DNA guidance where applicable
• Split out modules into 'designers'/ content editors and Developers (was 'Experimental')
• New module to expose HTML5 landmarks (footer, header etc) and explicitly set ARIA roles (but not those that are implicit, because that's not as useful for diagnosing coder errors)

NOTE: nothing is changed in the 'test' part of the code as I didn't use it. Or understand it, to be honest....

[khanbot]

CLA signature looks good 👍