Accessibility issues with WordPress.tv search form

[joedolson]

The WordPress.tv search form has two accessibility issues:

1) There's no visible focus, so when a user arrives at the form using a keyboard they can't tell. Add some kind of visible change for users arriving using a keyboard.

2) There's no label or submit button. A missing label makes it harder for screen-reader users to identify the purpose of the form, in particular. Add a label and a submit button to the form using the .screen-reader-text class and appropriate styles. Ideally, the submit button would also become visible on focus, but this would be more of an enhancement.

[SergeyBiryukov]

1473.​ adds a focus outline, a label and submit button: 1473.png​ .

[samuelsidler]

In 2332:

WordPress.tv: Improve accessibility of search form.

Props SergeyBiryukov.
Fixes #1473.