testharnessreport: Hide elements in tests by removing them from the document tree, instead of visibi

LayoutTests/resources/testharnessreport.js

 /*
  * THIS FILE INTENTIONALLY LEFT BLANK
  *
  * More specifically, this file is intended for vendors to implement
  * code needed to integrate testharness.js tests with their own test systems.
  *
  * Typically such integration will attach callbacks when each test is
  * has run, using add_result_callback(callback(test)), or when the whole test file has
  * completed, using add_completion_callback(callback(tests, harness_status)).
  *
@@ skipping 85 matching lines @@
 
     // Set results element's textContent to the results string
     results.textContent = resultStr;
 
     function done() {
         if (self.testRunner) {
             var logDiv = document.getElementById('log');
             if ((isCSSWGTest() || isJSTest()) && logDiv) {
                 // Assume it's a CSSWG style test, and anything other than the log div isn't
                 // material to the testrunner output, so should be hidden from the text dump
-                var next = null;
-                for (var child = document.body.firstChild; child; child = next) {
-                    next = child.nextSibling;
-                    if (child.nodeType == Node.ELEMENT_NODE)
-                        child.style.visibility = "hidden";
-                    else if (child.nodeType == Node.TEXT_NODE)
-                        document.body.removeChild(child);
-                }
+                document.body.textContent = '';
             }
         }
 
         // Add results element to document.
         if (!document.body)
             document.documentElement.appendChild(document.createElement("body"));
         document.body.appendChild(results);
 
         if (self.testRunner)
             testRunner.notifyDone();
     }
 
     if (document.readyState === 'loading') {
         window.addEventListener('load', done);
     } else {
         setTimeout(done, 0);
     }
 });