sphinx.ext.extlinks: Add extlink-{name} CSS class to links

doc/internals/contributing.rst

@@ -156,7 +156,7 @@ Please follow these guidelines when writing code for Sphinx:
 
 Style and type checks can be run as follows::
 
-    ruff .
+    ruff check .
     mypy sphinx/
 
 Unit tests

sphinx/ext/extlinks.py

@@ -91,9 +91,9 @@ def check_uri(self, refnode: nodes.reference) -> None:
 
 def make_link_role(name: str, base_url: str, caption: str) -> RoleFunction:
     # Check whether we have base_url and caption strings have an '%s' for
-    # expansion.  If not, fall back the the old behaviour and use the string as
+    # expansion.  If not, fall back to the old behaviour and use the string as
     # a prefix.
-    # Remark: It is an implementation detail that we use Pythons %-formatting.
+    # Remark: It is an implementation detail that we use Python's %-formatting.
     # So far we only expose ``%s`` and require quoting of ``%`` using ``%%``.
     def role(typ: str, rawtext: str, text: str, lineno: int,
              inliner: Inliner, options: dict[str, Any] | None = None,
@@ -108,6 +108,7 @@ def role(typ: str, rawtext: str, text: str, lineno: int,
             else:
                 title = caption % part
         pnode = nodes.reference(title, title, internal=False, refuri=full_url)
+        pnode["classes"].append(f"extlink-{name}")
         return [pnode], []
     return role
 

tests/test_builders/test_build_html_5_output.py

@@ -255,6 +255,8 @@ def checker(nodes):
     ('extensions.html', ".//a[@href='https://python.org/dev/']", "https://python.org/dev/"),
     ('extensions.html', ".//a[@href='https://bugs.python.org/issue1000']", "issue 1000"),
     ('extensions.html', ".//a[@href='https://bugs.python.org/issue1042']", "explicit caption"),
+    ('extensions.html', ".//a[@class='extlink-pyurl reference external']", "https://python.org/dev/"),
+    ('extensions.html', ".//a[@class='extlink-issue reference external']", "issue 1000"),
 
     # index entries
     ('genindex.html', ".//a/strong", "Main"),