anchor.diff:          }
         }, true);
     }
  -
  +  
     /** Escape HTML special chars. */
     String _escape(String str) {
       str = str.replaceAll('&','&amp;');
  
positive.code:       }, true);
        toolDiv.appendChild(exportBtn);
        testBody.appendChild(toolDiv);
  
        // Create a datalist element for showing test status
        HTMLDListElement statList = _runnerWindow.document.createElement('dl');
        statList.className = 'dt-status';
  
negative.code:       _showCoverageControls();
        _changeTabs(coverageTab, testingTab);
      }, true);
      tabList.appendChild(coverageTab); 
      tabDiv.appendChild(tabList);
      containerDiv.appendChild(tabDiv);
      
      if(_runnerWindow != window) {
        HTMLDivElement popIn = _runnerWindow.document.createElement('div');
        popIn.className = 'dt-minimize';
        popIn.innerHTML = 'Pop In &#8690;';
        popIn.addEventListener('click', (event) => _dartestMinimize(), true);
        containerDiv.appendChild(popIn);
      }  
      
      containerDiv.appendChild(mainElem);
      _runnerWindow.document.body.appendChild(containerDiv);
    }
    
    void _changeTabs(HTMLLIElement clickedTab, HTMLLIElement oldTab) {
      oldTab.className = '';
      clickedTab.className = 'dt-tab-selected';
    }
    
    void _showTestControls() {
      HTMLDivElement testBody = _appElements.testBody;
      if(testBody == null) {
        testBody = _runnerWindow.document.createElement('div');
        _appElements.testBody = testBody;
      
        // Create a toolbar to hold action buttons
        HTMLDivElement toolDiv = _runnerWindow.document.createElement('div');
        toolDiv.className = 'dt-toolbar';
  