Anchor blob lines so #L fragments work

Wrap each rendered line in a <span id="Ln">, for both syntax-highlighted
and plain-text blobs, and shade the line a fragment targets.

1 files changed, 4 insertions, 0 deletions

diff --git a/public/static/style.css b/public/static/style.css
index a83e128..1d277b7 100644
--- a/public/static/style.css
+++ b/public/static/style.css
@@ -286,6 +286,10 @@ object.pdf {
 pre.box {
   /* Instead of scrolling overflow for long lines, grow the box. */
   width: fit-content;
+
+  span:target {
+    background: var(--shade-background);
+  }
 }
 
 .overview, .release, .wiki {