Shouldn't the CSSOM construction also wait for javascript execution like DOM construction does? After all, Javascript has the ability to modify elements within the document as well as insert or delete them. By that same logic, shouldn't CSSOM also hold off until javascript is finished running, considering its potential to alter the styling of elements?
Absolutely not.
When it comes to altering HTML content being parsed, JavaScript reigns supreme with its ability to utilize document.write. This process is far more intricate than simple style modifications or the insertion of elements via DOM methods.
Comparatively speaking, repaints caused by CSS adjustments are quite minor and insignificant.
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