What kinds of activities will trigger reflow of web page with DOM?  It seems there are different points of view. According to http://www.nczonline.net/blog/2009/02/03/speed-up-your-javascript-part-4/,  it happens   When you add or remove a DOM node...
I am building non-jQuery responsive image slider based on CSS3 transitions.  The structure is simple: a viewport and inside relatively positioned UL with left floated LIs.  I am facing a problem in such situation:   User clicks "prev" arrow...
When we are applying a lot of style changes using JavaScript to a single element, phpied & Writing Efficient JavaScript (slide 87) suggests:      instead of applying styles one by one using style.stylename, apply everything in one go using cssTex...
I have a wordpress site. Under single.php, I have the following body tag      <body <?php body_class(); ?>  onLoad="func(<?php echo $thePostID?>);" >   Reading articles on the web made me convinced of avoiding inline CSS and...
I have a page where the user can dynamically add file upload boxes.  Adding the boxes changes the height of the div they are in, but certain elements of the div below it stay in the same place, so they start to overlap with the new DOM elements.  Thi...
You can detect a browser scroll event on an arbitrary element with:  element.addEventListener('scroll', function (event) {     // do something });   I would like to be able to differentiate between vertical scrolling and horizontal scrolling...
I need to be able to benchmark a particular build of a webkit-based browser and am measuring the length of time it takes to do certain stuff like DOM manipulation, memory limits etc.  I have a test below which records the length of time it takes to s...
Note: This is not a duplicate as far as I can tell, as using a contentEditable div doesn't seem to be a good alternative. It has numerous problems (no placeholder text, need to use the dangerouslySetInnerHTML hack to update text, selection cursor...
I'm trying to fix some slow-performing javascript in a sluggish UI, and I've narrowed the main cause down to a jQuery .width() call used to see the actual pixel size of a width: 100% element in a responsive layout, in a process that needs to...
I'm wondering if animating the scrollbars with Javascript triggers browser reflow.  Any difference across different browser implementations?  window.pageXOffset & window.pageYOffset document.documentElement.scrollLeft & document.documentE...

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