in MotionMark/resources/debug-runner/debug-runner.js [284:294]
_updateSuiteCheckboxState: function(suiteCheckbox)
{
var numberEnabledTests = 0;
suiteCheckbox.testsElements.forEach(function(testElement) {
var testCheckbox = this._checkboxElement(testElement);
if (testCheckbox.checked)
++numberEnabledTests;
}, this);
suiteCheckbox.checked = numberEnabledTests > 0;
suiteCheckbox.indeterminate = numberEnabledTests > 0 && numberEnabledTests < suiteCheckbox.testsElements.length;
},