Add theme support to make tag cloud widget output list of links wrapped within a <nav> element

[audrasjb]

Follow-up to https://core.trac.wordpress.org/ticket/48170#comment:36

Tag cloud widget was missed from #48170.

[audrasjb]

Accessibility: Widgets: Add theme support to make tag cloud widget output list of links wrapped within a <nav> element.

[audrasjb]

51455.diff addresses this issue.

Please don't forget to give proper props to @justinahinon who raised the issue in https://core.trac.wordpress.org/ticket/48170#comment:36

[ravipatel]

@audrasjb @justinahinon
Why not use this code

$title      = trim( strip_tags( $title ) );
$aria_label = $title ? $title : $default_title;

Change With

$title      = wp_strip_all_tags( $title );
$aria_label = $title ? $title : $default_title;

[audrasjb]

@ravipatel I'd prefer to keep consistency with the other existing widgets code (see category widget for reference) :)

[SergeyBiryukov]

In 49177:

Accessibility: Widgets: Conditionally wrap the tag cloud widget in a <nav> element.

If the theme declares support for the html5 feature navigation-widgets, the tag cloud widget is now wrapped in a <nav> element to improve semantics and accessibility.

The <nav> elements are native landmark regions, which helps assistive technology users to navigate through them.

Follow-up to [48349] for other widgets.

Props audrasjb, justinahinon, ravipatel.
Fixes #51455. See #48170.

[daisyo]

Dev note published: ​https://make.wordpress.org/core/2020/11/20/miscellaneous-developer-focused-changes-in-wordpress-5-6/