1 <!DOCTYPE html> 2 <html> 3 <head> 4 <script src="../resources/runner.js"></script> 5 <style> 6 .root .child {} 7 </style> 8 </head> 9 <body> 10 <div id="root"></div> 11 <script> 12 function addChildren(element, numChildren, idPrefix) 13 { 14 for (var i = 0; i < numChildren; i++) { 15 var child = document.createElement("div"); 16 child.id = idPrefix + i; 17 element.appendChild(child); 18 } 19 } 20 21 function makeTree(element, depth, fanOut, idPrefix) 22 { 23 if (depth <= 0) 24 return; 25 addChildren(element, fanOut, idPrefix); 26 for (var child = element.firstChild; child.nextSibling; child = child.nextSibling) { 27 makeTree(child, depth - 1, fanOut, child.id); 28 } 29 if (child) 30 makeTree(child, depth - 1, fanOut, child.id); 31 } 32 33 var root = document.querySelector("#root"); 34 makeTree(root, 6, 5, "child"); 35 36 var child = document.querySelector("#child012341"); 37 child.className = "child"; 38 var runFunction = function() 39 { 40 root.offsetHeight; // force recalc style 41 root.className = "root"; 42 root.offsetHeight; 43 root.className = ""; 44 } 45 46 PerfTestRunner.measureRunsPerSecond({run: runFunction}); 47 48 </script> 49 </body> 50 </html> 51
