From 352ebb1477d6dd9ae875f7b6ab516d189f07ceee Mon Sep 17 00:00:00 2001
From: Eric Kaden <608341+EricKaden@users.noreply.github.com>
Date: Fri, 23 Oct 2026 17:28:22 -0400
Subject: [PATCH] M12: a backslash ends a web link's host, as web addresses
 read it

---
 crates/xfa/src/pdf.rs   | 7 ++++---
 crates/xfa/src/tests.rs | 2 +-
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/crates/xfa/src/pdf.rs b/crates/xfa/src/pdf.rs
index 833fae875..61b287e3d 100644
--- a/crates/xfa/src/pdf.rs
+++ b/crates/xfa/src/pdf.rs
@@ -779,10 +779,11 @@ fn link_target(href: &str) -> Option<&str> {
     ok.then_some(href)
 }
 
-/// Whether `after` (a web address past its `//`) names a host: what comes before the path, query
-/// or fragment, past any user name and before any port, isn't empty.
+/// Whether `after` (a web address past its `//`) names a host: what comes before the path (which a
+/// backslash starts too, as web addresses read it), query or fragment, past any user name and
+/// before any port, isn't empty.
 fn has_host(after: &str) -> bool {
-    let authority = after.split(['/', '?', '#']).next().unwrap_or_default();
+    let authority = after.split(['/', '\\', '?', '#']).next().unwrap_or_default();
     let host = authority.rsplit('@').next().unwrap_or_default();
     // An IPv6 host is bracketed and holds colons of its own.
     let host = if host.starts_with('[') { host } else { host.split(':').next().unwrap_or_default() };
diff --git a/crates/xfa/src/tests.rs b/crates/xfa/src/tests.rs
index e4a0c410d..9901903bc 100644
--- a/crates/xfa/src/tests.rs
+++ b/crates/xfa/src/tests.rs
@@ -511,7 +511,7 @@ fn a_rule_between_two_pieces_of_a_link_keeps_them_apart() {
 fn links_to_anything_but_web_and_email_addresses_stay_plain_text() {
     let long = format!("https://example.com/{}", "a".repeat(2100));
     let body = format!(
-        r#"<a href="javascript:app.alert(1)">one</a> <a href="file:///etc/passwd">two</a> <a href="data:text/html,x">three</a> <a href="help.html">four</a> <a href="HTTPS:">five</a> <a href="{long}">six</a> <a href="MailTo:a@example.com">seven</a> <a href="https:///path">eight</a> <a href="https://user@:8080/x">nine</a> <a href="https://user@example.com:8443/x">ten</a>"#
+        r#"<a href="javascript:app.alert(1)">one</a> <a href="file:///etc/passwd">two</a> <a href="data:text/html,x">three</a> <a href="help.html">four</a> <a href="HTTPS:">five</a> <a href="{long}">six</a> <a href="MailTo:a@example.com">seven</a> <a href="https:///path">eight</a> <a href="https://user@:8080/x">nine</a> <a href="https://\example.com/path">nine and a half</a> <a href="https://user@example.com:8443/x">ten</a>"#
     );
     let mut doc = Document::open(Arc::new(shell(&rich_draw_form("7in", &body)))).unwrap();
     let report = render_into(&mut doc).unwrap();