Custom HTML block: line numbers lack sufficient contrast

[sarahmonster]

Line numbers may not be considered critical to the user experience, but with the current shade of grey, they don't have sufficient contrast with the white background:

The color combination #999999/#ffffff has a contrast ratio of 2.85, which is not sufficient. At this size, you will need a ratio of at least 4.5.

[earnjam]

Looks like this is due to CodeMirror's default styles. FWIW, it's a problem with core's implementation of Custom CSS as well.

Using #666 solves it in both places, so we should probably fix in core as well while we're tackling it.

[earnjam]

Created a core ticket for this: https://core.trac.wordpress.org/ticket/44763

[abdullah1908]

@earnjam patch updated on core track regarding this fix 👍
https://core.trac.wordpress.org/ticket/44763#comment:4

[nerrad]

It doesn't look like the html block uses code mirror anymore (and there are no line numbers so I'm going to close this.