Fix code to ignore titles when we already have one.

JSDOMParser.js

@@ -1008,7 +1008,10 @@
         }
       }
 
-      if (localName === "title") {
+      // Only use the first title, because SVG might have other
+      // title elements which we don't care about (medium.com
+      // does this, at least).
+      if (localName === "title" && !this.doc.title) {
         this.doc.title = node.textContent.trim();
       } else if (localName === "head") {
         this.doc.head = node;

test/test-pages/medium-2/expected-metadata.json

@@ -1,5 +1,5 @@
 {
-  "title": "sidebar-open-28px",
+  "title": "On Behalf of “Literally” — Medium",
   "byline": "Courtney Kirchoff",
   "excerpt": "In defense of the word “literally” and why you or someone you know should stop misusing the word, lest they drive us fig…"
 }