When Does Reflow Occur in a DOM Environment?
Reflow is a process in a DOM environment that recalculates the layout and position of elements. Determining when reflow occurs is crucial for optimizing JavaScript performance.
Types of Activities That Trigger Reflow
There are two primary sources that describe reflow triggers:
Nczonline.net states that reflow occurs when:
Reconciling the Differences
However, both articles essentially agree that any action that requires the calculation of element dimensions can trigger reflow. This includes:
Conclusion
To ensure optimal performance, assume that any activity that reasonably necessitates the calculation of DOM element dimensions will likely trigger reflow. By understanding these triggers, developers can optimize their JavaScript code by minimizing reflows, cacheing values, or using other techniques that reduce the impact on DOM recalculation.
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