Rule Definition
Compared to getElementsByTagName and getElementsByClassName, querySelectorAll can be 40 time slower.
Remediation
Instead of using querySelectorAll, you will use getElementsByTagName() or getElementsByClassName().
Violation Code Sample
var trs = tabtab.querySelectorAll('.rowme');
Fixed Code Sample
var trs = tabtab.getElementsByTagName('tr');
or
var trs = tabtab.getElementsByClassName('rowme');
Reference
[1] http://www.infoq.com/presentations/JavaScript-Performance-Patterns [2] http://jsperf.com/queryinging/4 OMG CISQ ASCPEM-PRF-4
Related Technologies
HTML5
Technical Criterion
CWE-1050 - Excessive Platform Resource Consumption within a Loop
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