Remove unusable, non-legible aria-label

[aduth]

This pull request seeks to remove the aria-label attribute from the rendered iframe. Because the iframe is already rendered with aria-hidden, it is removed from the accessibility tree and thus the aria-label would never be used. Furthermore, the label itself may or may not be readable in its current form, depending how well assistive technology interprets the dash of "resize-listener" (vs., say, "resize listener").

References:

• https://stackoverflow.com/a/52841858
• https://a11y-guidelines.orange.com/web_EN/exemples/iframes-techniques/index.html
• https://wordpress.slack.com/archives/C02RP4X03/p1584717155024800 (link requires registration)

[FezVrasta]

Thanks!

[aduth]

Thanks for merging this @FezVrasta . Any chance a release could be published which includes this change? It's come up again in our project at WordPress/gutenberg#22864 .

[FezVrasta]

Done

[aduth]

Thanks for the quick turnaround! ❤️

[FezVrasta]

It only took 6 months 😂

[aduth]

Hah! Well, just to be clear, I meant between my follow-up and the release 😉

It's appreciated all the same.