Setting host without port should keep old port

LayoutTests/fast/dom/HTMLAnchorElement/script-tests/set-href-attribute-host.js

 description('Test setting the host attribute of the URL in HTMLAnchorElement.');
 
 var a = document.createElement('a');
 
 debug("Basic test");
 a.href = "https://www.mydomain.com:8080/path/";
 a.host = "www.otherdomain.com:0";
 shouldBe("a.href", "'https://www.otherdomain.com:0/path/'");
 
+debug("Set host without port");
+a.href = "https://www.mydomain.com:8080/path/";
+a.host = "www.otherdomain.com";
+shouldBe("a.href", "'https://www.otherdomain.com:8080/path/'");
+
 // IE8 throws "The URL is invalid" exception.
 debug("Set host with '?' in it");
 try {
 a.href = "https://www.mydomain.com:8080/path/?key=value";
 a.host = "www.other?domain.com:8080";
 shouldBe("a.href", "'https://www.other/?domain.com:8080/path/?key=value'");
 } catch(e) {
 debug("Exception: " + e.description);
 }
 
 debug("Set default port for another protocol");
 a.href = "https://www.mydomain.com:8080/path/";
 a.host = "www.otherdomain.com:80";
 shouldBe("a.href", "'https://www.otherdomain.com:80/path/'");
 
 debug("Set default port");
 a.href = "https://www.mydomain.com:8080/path/";
 a.host = "www.otherdomain.com:443";
 shouldBe("a.href", "'https://www.otherdomain.com/path/'");
 
+debug("Set host with invalid port");
+a.href = "https://www.mydomain.com:8080/path/";
+a.host = "www.otherdomain.com:invalid";
+shouldBe("a.href", "'https://www.otherdomain.com:0/path/'");
+
 // Firefox 3.5.2 rejects a port that contains non-digits.
 debug("Set host with letters in port number");
 a.href = "https://www.mydomain.com:8080/path/";
 a.host = "www.otherdomain.com:44a5";
 shouldBe("a.href", "'https://www.otherdomain.com:44/path/'");
 
 // Firefox 3.5.2 ignores the leading space in the port, but errs on reparsing the port.
 debug("Leading space in port number");
 a.href = "https://www.mydomain.com:8080/path/";
 a.host = "www.otherdomain.com: 443";
@@ skipping 22 matching lines @@
 debug("Set host to URL with file: protocol");
 a.href = "file:///path/";
 a.host = "mydomain.com";
 shouldBe("a.href", "'file://mydomain.com/path/'");
 
 // IE8 throws if the host contains '/'
 debug("Set host containing slashes in it");
 try {
 a.href = "https://www.mydomain.com:8080/path/";
 a.host = "www.other\dom/ain.com";
-shouldBe("a.href", "'https://www.otherdom/ain.com/path/'");
+shouldBe("a.href", "'https://www.otherdom%2Fain.com:8080/path/'");
 } catch(e) {
 debug("Exception: " + e.description);
 }
 
 // WebKit fails to strip the \r in the authority, and therefore treats the URL as invalid
 // and gets a different result than Firefox or Chrome; we should probably strip it
 debug("Set host to a malformed URL");
 a.href = "https:/\rww.my@domain.com:8080/path/";
 a.host = "www.other!domain.com:15";
 shouldBe("a.href", "'https:/\\rww.my@domain.com:8080/path/'");
@@ skipping 19 matching lines @@
 } catch(e) {
 debug("Exception: " + e.description);
 }
 
 // Both IE8 and Firefox append the hosts, instead of rejecting, per
 // http://dev.w3.org/html5/spec/infrastructure.html#url-decomposition-idl-attributes .
 debug("Set host to a URL with tel: protocol");
 a.href = "tel:+1-816-555-1212";
 a.host = "+1-800-555-1212";
 shouldBe("a.href", "'tel:+1-816-555-1212'");