Send Trackbacks postbox: improve the visual description

[afercia]

In the "Send Trackbacks" postbox, the short sentence with a "hint" about how to enter data should have a howto CSS class for visual consistency with descriptions used in other places in the admin, see for example the "Tags" postbox in the top part of the screenshot:

Also, it would be a nice, small, accessibility improvement using this paragraph as target for an aria-describedby attribute.

[afercia]

In the proposed patch:

• improve the "Send Trackbacks" postbox using an aria-describedby attribute targeting its description
• make the description visually consistent with other descriptions

[michaelarestad]

The patch looks good and much improved visually. Is there an intentional newline at the end of line 595? (code standards thing?)

[afercia]

Replying to michaelarestad:

The patch looks good and much improved visually. Is there an intentional newline at the end of line 595? (code standards thing?)

Yep, split in a new line a very long line for better readability. Was sure it was also mentioned in the coding standards but apparently is gone and now I can only see a generic reference in the JavaScript standards: ​...remember the line length guidelines...

[michaelarestad]

Cool. Figured it was something like that.

[afercia]

In 35983:

Accessibility: Improvements for the "Send Trackbacks" postbox.

Adds an aria-describedby attribute targeting the input field description and styles the description as a... description.

Fixes #35123.