XML snippets in rfcxml-vocabulary could be made more accessible

[ajeanmahoney]

The current palette choice for XML snippets may make reading the snippets difficult for someone with colorblindness. For example, the red and green text on a black background found on https://authors.ietf.org/rfcxml-vocabulary#artwork would be difficult for someone with red/green colorblindness to read because colors would appear both dim and the same. (The XML snippets are somewhat eye-straining for me also, and I'm not colorblind).

[JayDaley]

Wiki.js uses https://highlightjs.org as its syntax highlighting library. We'll try to figure out how to use high/higher contrast highlighting with that library

[JayDaley]

This is their list of themes https://github.com/highlightjs/highlight.js/tree/main/src/styles but as noted in this issue highlightjs/highlight.js#3392 they are not labelled by the contrast ratio or WCAG compliance.

On the front page of their site https://highlightjs.org you can click on 'style' underneath the code snippet and it chooses another. From that it looks like maybe 'agate' is best for xml - https://highlightjs.org/?snippet=1&style=10

@ajeanmahoney and/or @rjsparks Can you please confirm that agate is suitable and I will then get that set as the theme.

[rjsparks]

agate works for me. (Either of the solarized would also work if we find that agate is problematic later).

[ajeanmahoney]

agate also works for me. I like the contrast. The blues and greens may appear as similar colors to a person with blue-yellow colorblindness, but I think we can go forward with the palette. As Robert says, we can make updates if we receive new feedback.

[JayDaley]

It appears that configuring the underlying highlight.js library is not straightforward. This may require waiting until the next next major version of Wiki.js is released.