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What forces layout / reflow

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.

Element

Box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
• elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
• elem.getClientRects(), elem.getBoundingClientRect()

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(function(){
  var me, myself, irene
  
  // logic
}())

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(function(){
  var me, myself, irene
  
  // logic
})()

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(2) = 2

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Uncaught SyntaxError: Unexpected token (

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function(){
  var me, myself, irene
  
  // logic
}()

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var myCode = function(){
  var me, myself, irene
  
  // logic
}()

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/* global scope */

// third-party code

// our code

var myCode = function(){
  var me, myself, irene
  
  // logic 

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/* global scope */

// third-party code

// our code

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var awesome

var myFunc = function() {
  var awesome
}