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diff --git a/src/markup/__tests__/PhutilMarkupTestCase.php b/src/markup/__tests__/PhutilMarkupTestCase.php
--- a/src/markup/__tests__/PhutilMarkupTestCase.php
+++ b/src/markup/__tests__/PhutilMarkupTestCase.php
@@ -72,11 +72,20 @@
// These should get the implicit insertion.
'http://www.example.org/' => true,
- '///evil.com/' => true,
' http://www.example.org/' => true,
'ftp://filez.com' => true,
'mailto:santa@northpole.com' => true,
'tel:18005555555' => true,
+
+ // These are protocol-relative hrefs. Browers will treat a URI with
+ // a leading slash followed by any positive number of slashes and
+ // backslashes as a protocol-relative link.
+ '//evil.com/' => true,
+ '/\\evil.com/' => true,
+ '///evil.com/' => true,
+ '//\\evil.com/' => true,
+ '/\\/evil.com/' => true,
+ '/\\\\/evil.com' => true,
);
foreach ($map as $input => $expect) {
diff --git a/src/markup/render.php b/src/markup/render.php
--- a/src/markup/render.php
+++ b/src/markup/render.php
@@ -35,9 +35,14 @@
$is_anchor_href = ($href[0] == '#');
// Is this a link to a resource on the same domain? The second part of
- // this excludes "///evil.com/" protocol-relative hrefs.
- $is_domain_href = ($href[0] == '/') &&
- (!isset($href[1]) || $href[1] != '/');
+ // this excludes "//evil.com/" protocol-relative hrefs. The third part
+ // of this excludes "/\evil.com/" protocol-relative fantasy hrefs which
+ // are completely made up but which browsers all respect. Broadly,
+ // browsers will dutifuly treat "/" followed by ANY sequence of "/" and
+ // "\" as though it were "//".
+ $is_domain_href =
+ ($href[0] == '/') &&
+ (!isset($href[1]) || ($href[1] != '/' && $href[1] != '\\'));
// If the `rel` attribute is not specified, fill in `rel="noreferrer"`.
// Effectively, this serves to make the default behavior for offsite

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