Use event path to detect if anchor has been clicked in WebUIs.

ui/webui/resources/js/util.js

Index: ui/webui/resources/js/util.js
diff --git a/ui/webui/resources/js/util.js b/ui/webui/resources/js/util.js
index 293205804389a21425c26bc0c26756533d9e42ea..d4207ad87e1b8897bb900f538af0abe08ea9629d 100644
--- a/ui/webui/resources/js/util.js
+++ b/ui/webui/resources/js/util.js
@@ -216,26 +216,31 @@ document.addEventListener('click', function(e) {
   if (e.defaultPrevented)

[Dan Beam, 2016/08/02 06:02:44]

nit: in my ideal world

if (e.defaultPrevented || e.button > 1)
  return;

var link = e.path.find(el => el.tagName == 'A' && el.href);
if (!link || !['about:', 'file:'].includes(link.protocol))
  return;

chrome.send('navigateToUrl', [
  link.href,
  link.target,
  e.button,
  e.altKey,
  e.ctrlKey,
  e.metaKey,
  e.shiftKey
]);
e.preventDefault();

BUT =>, .find(), and .includes() wont work in Safari, so bollocks

[calamity, 2016/08/08 05:06:43]

Acknowledged.

     return;
 
-  var el = e.target;
-  if (el.nodeType == Node.ELEMENT_NODE &&
-      el.webkitMatchesSelector('A, A *')) {
-    while (el.tagName != 'A') {
-      el = el.parentElement;
+  var eventPath = e.path;

[Dan Beam, 2016/08/02 06:02:43]

this code runs on safari, which may have dodgy support for path (if any).  you
probably need to handle target as well or something...

[calamity, 2016/08/08 05:06:43]

Done.

+  var anchor = null;
+  for (var i = 0; i < eventPath.length; i++) {
+    var element = eventPath[i];
+    if (element.tagName === 'A' && element.href) {
+      anchor = element;
+      break;
     }
+  }
 
-    if ((el.protocol == 'file:' || el.protocol == 'about:') &&
-        (e.button == 0 || e.button == 1)) {
-      chrome.send('navigateToUrl', [
-        el.href,
-        el.target,
-        e.button,
-        e.altKey,
-        e.ctrlKey,
-        e.metaKey,
-        e.shiftKey
-      ]);
-      e.preventDefault();
-    }
+  if (!anchor)
+    return;
+
+  if ((anchor.protocol == 'file:' || anchor.protocol == 'about:') &&
+      (e.button == 0 || e.button == 1)) {
+    chrome.send('navigateToUrl', [
+      anchor.href,
+      anchor.target,
+      e.button,
+      e.altKey,
+      e.ctrlKey,
+      e.metaKey,
+      e.shiftKey
+    ]);
+    e.preventDefault();
   }
 });