1.

When does DOM reflow occur?

Answer»

Reflow is the name of the web browser process for re-calculating the positions and geometries of elements in the document, for the purpose of re-rendering part or all of the document. 

Reflow OCCURS when:

  • Insert, REMOVE or UPDATE an element in the DOM.
  • Modify content on the page, e.g. the text in an input box.
  • Move a DOM element.
  • Animate a DOM element.
  • Take measurements of an element such as offsetHeight or getComputedStyle.
  • Change a CSS style.


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