All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.
Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.
elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
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“I perfectly understand our CSS. I never have any issues with cascading rules. I never have to use !important or inline styles. Even though somebody else wrote this bit of CSS, I know exactly how it works and how to extend it. Fixes are easy! I have a hard time breaking our CSS. I know exactly where to put new CSS. We use all of our CSS and it’s pretty small overall. When I delete a template, I know the exact corresponding CSS file and I can delete it all at once. Nothing gets left behind.”
You often hear updog saying stuff like this. Who’s updog? Not much, who is up with you?
| ## | |
| # test/spec/mini 5 | |
| # http://gist.github.com/307649 | |
| # chris@ozmm.org | |
| # | |
| def context(*args, &block) | |
| return super unless (name = args.first) && block | |
| require 'test/unit' | |
| klass = Class.new(defined?(ActiveSupport::TestCase) ? ActiveSupport::TestCase : Test::Unit::TestCase) do | |
| def self.test(name, &block) |
