The list of function name isn't readable properly.

[rima1889]

I'm finding below issue on ​https://developer.wordpress.org/reference/functions/.
1) The style of function name hide underscore(_) because of style of underline( text-decoration: underline ).
2) The underline also display out of Functions name.

[dd32]

There's a potential that it's intended not to have underlines here, as there's already a dotted underline set on the :hover.

I do actually have a uncommited diff to remove this underline already, but didn't move forward with it myself as it only fixes the function listing, and not all the other locations where function/class names are referenced as links with an underline (For example Return Values, and Related functions on individual function pages)

scss/main.scss

@@ -1063 +1063 @@
                         .arg-default {
                                 color: #000000;
                         }
-                        a:hover {
-                                border-bottom: 1px dotted #21759b;
+                        a {
+                                text-decoration: none;
+
+                                &:hover {
+                                        border-bottom: 1px dotted #21759b;
+                                }
                         }
                 }
                 h2 {

[ryelle]

Ideally links should have more than just color to differentiate them from surrounding text, so rather than removing the text-decoration, maybe try ​text-underline-offset? 0.2em seems like a good distance in playing with it in Inspector.

[dd32]

Replying to ryelle:

Ideally links should have more than just color to differentiate them from surrounding text

Totally agreed.

maybe try ​text-underline-offset?

I didn't even know that was a thing :) That sounds like a perfect solution to me.

Perhaps we could use something like a.underscores { text-underline-offset: 0.2em; } and apply that class where needed instead of trying to target things purely in CSS?

[ryelle]

I think the 0.2em offset is small enough that it would be fine to drop onto .devhub-wrap .site-main a for all devhub links, but a has-underscores class could be useful elsewhere (or underscores, IDK if we have a naming standard either way).

[coffee2code]

Fixed in ​c7b879e on GitHub back in May 2022. The underline was removed in the manner Dion proposed in comment 2.