code: function _findMatchingRulesInStyleBlocks(htmlDocument, selector, resultSelectors) {
          // HTMLUtils requires a real CodeMirror instance; make sure we can give it the right Editor
          var htmlEditor = EditorManager.getCurrentFullEditor();
          if (htmlEditor.document !== htmlDocument) {
              console.error("Cannot search for <style> blocks in HTML file other than current editor");
              return;
          }
  
          // Find all <style> blocks in the HTML file
          var styleBlocks = HTMLUtils.findStyleBlocks(htmlEditor);
  
          styleBlocks.forEach(function (styleBlockInfo) {
              // Search this one <style> block's content, appending results to 'resultSelectors'
              var oneStyleBlockMatches = _findAllMatchingSelectorsInText(styleBlockInfo.text, selector);
              _addSelectorsToResults(resultSelectors, oneStyleBlockMatches, htmlDocument, styleBlockInfo.start.line);
          });
      }
docs: Finds matching selectors in the <style> block of a single HTML file; adds them to 'resultSelectors'