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Polish link underline in Darkfish CSS #1349

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Polish link underline in Darkfish CSS #1349

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Polish link underline in Darkfish CSS
ybiquitous Apr 28, 2025
f730435
Increase `text-underline-offset` value with `em` unit
ybiquitous Apr 29, 2025
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2 changes: 2 additions & 0 deletions lib/rdoc/generator/template/darkfish/css/rdoc.css
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Expand Up @@ -96,6 +96,8 @@ main .anchor-link:target {
a {
color: var(--link-color);
transition: color 0.3s ease;
text-decoration: underline;
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Do we need this?

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@ybiquitous ybiquitous Apr 28, 2025 •
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text-decoration: underline isn't necessarily required, but most browsers have it in their default user agent stylesheets. This is an example of Chrome:
image

So, I've added it to prevent our confusion, e.g., "Why is text-underline-offset specified, regardless text-decoration is not?"

If we want to respect browsers that don't have text-decoration: underline by default, we can remove it (text-underline-offset is just ignored). 👌🏼 In this case, it might be helpful to add a code comment that describes the reason for not having text-decoration.

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I have a question. We're adding this underline offset to all links, but not every link is a method name.

Will this look okay for other links that aren't method names? Should we use a more specific selector to match just method names or is the visual consistency better?

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I think underline offset is fine for every links.
Link text could be an URL or a filename that contains underscore. Appearance of these links also gets better.

Another example, GitHub's "Convert to draft" link and URL in pull request description text also has text-underline-offset: .2rem; // about 3.2px.

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Thanks for the feedback. For your information, it's easy to restrict only links that have <code>, but it might be harder for other links, e.g.

<a href="..."><code>::check_modeline</code></a>

<a href="...">::check_modeline</a>
/* This is applied into the first `<a>` only, not the second one. */
a:has(code) { text-underline-offset: 3px; }

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@ybiquitous ybiquitous Apr 29, 2025 •
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As GitHub does, we can also use the rem unit instead of px. rem has a relative value from the root font size, so it might be better to maintain.

Considering the favors on #1349 (comment), I'll adjust the value if no other concerns:

  • Use rem instead of px
  • Increase the offset value from 2px to keep more space.

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I've increased the text-underline-offset value from 2px to 0.2em via f730435. See the following screenshots to see the new value:

  • image
  • image

Indeed, 0.2em is interpreted as 3.2px since the <main> and <nav> have font-size: 16px (16px * 0.2 == 3.2px):

The reason that I chose the em unit instead of rem is because the Darkfish CSS doesn't specify font-size to :root or html elements (rem stands for "root em"). If this CSS has font-size for :root in the future, we may need to reconsider the em value at the same time.

text-underline-offset: 0.2em; /* Make sure it doesn't overlap with underscores in a method name. */
}

a:hover {
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