Some documentation pages contain long headings with unbroken strings
that can exceed the content width and cause page-wide horizontal scroll
overflow.

Allow headings to wrap when needed so they stay within the content
column and do not break page layout.

Browsers do not treat underscores as natural wrap points, so some
code-style headings may still wrap awkwardly. That trade-off is
preferable to allowing horizontal scroll overflow, since headings
should remain immediately visible rather than partly hidden behind
horizontal scrolling.

Examples:
  https://docs.kernel.org/6.15/userspace-api/gpio/gpio-v2-line-get-values-ioctl.html
  https://docs.kernel.org/6.15/userspace-api/sysfs-platform_profile.html

Signed-off-by: Rito Rhymes <rito@ritovision.com>
Assisted-by: Codex:GPT-5.4
---
v3: add latest public versioned URL examples to the patchlog

 Documentation/sphinx-static/custom.css | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/sphinx-static/custom.css b/Documentation/sphinx-static/custom.css
index db24f4344..14711c7be 100644
--- a/Documentation/sphinx-static/custom.css
+++ b/Documentation/sphinx-static/custom.css
@@ -8,6 +8,13 @@ div.body h1 { font-size: 180%; }
 div.body h2 { font-size: 150%; }
 div.body h3 { font-size: 130%; }
 div.body h4 { font-size: 110%; }
+/*
+ * Let long headings wrap before they overflow page layout.
+ */
+div.body h1, div.body h2, div.body h3, div.body h4,
+div.body h5, div.body h6 {
+    overflow-wrap: anywhere;
+}
 
 /* toctree captions are styled like h2 */
 div.toctree-wrapper p.caption[role=heading] { font-size: 150%; }
-- 
2.51.0