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 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...
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...
Say, I've got an HTML file that I want to process using Javascript. For example:   Add some DOM elements, like span or div wrappers. Change the document styling a bit, like base font size, line-height, etc. Use a hyphentor to add &shy; entiti...
I'm designing a JavaScript/HTML-driven user interface on embedded hardware with weak CPU and WebKit.  Performance is not ideal, and I want to profile the application, especially timing the reflow and repaint events to get hard data on actual perf...
To make it clear what I'm asking, here is my example (fiddle).  I have a list of ~500 random names. I have an input at the top that has live-style searching. On every keyup, the value of the input is taken, and every item in the list is matched a...
Based on this question: How do I know the IntersectionObserver scroll direction?     I was trying to reproduce some layout/reflow cases within the observable callback, but I couldn't, so I tried to simplify the use case and end up asking this que...

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