Update F74.html

[detlevhfischer]

• Tried to give an idea of what is meant by a clear label (= one that clearly references the corresponding text section)
• Changed the tax form example to a registration form instruction as part of a larger set of service instructions (so that the difficulty of associating the synchronized media alternative for that one part is made more obvious when the video is at the bottom of the entire set of instructions)

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[patrickhlauke]

Related to #3661 ?

[detlevhfischer]

Yes, I now added closes... above.

[patrickhlauke]

might be worth extending this to add something in the understanding documents for all relevant SCs, not just relying on shoving something in a technique (where nobody bothers to look for interpretation)

[patrickhlauke]

While this PR makes a few nice little edits, i don't think it fully closes #3661 (partly because the concept is still a bit vague, and partly because this shouldn't just be hidden in a technique, but surfaced in the understanding documents at least - particularly if the concept is rather handwavy/vague).

[patrickhlauke]

does it necessarily need to be a "text label"? what does a "text label" for a video even look like/what is it? is it text that precedes or follows a video? the video's title that is shown on the initial paused/stopped video thumbnail? just the text alternative behind the video element?

[detlevhfischer]

I guess the video label would need to be text to reference a particular section for which it is an alternative, yes -- it might just be something like "Part 3 - video" or similar. Leaving open whether the label is above or below the video does not preclude either position, we don't want to be too prescriptive here I guess. Adjaceny would be critical though. I think the label would need to be available for all users next to the video before playing, so sighted users not good at reading longer text (for language skills or cognitive reasons) can make the connection.