CSS contains

Adding 'contain: content' in CSS reduces the time to recalculate my stylesheet by a quarter. 


Using 'contain: strict' makes the content disappear as I have not specified a height.


Adding 'contains' tries to stop CSS changes within that branch of the DOM tree affecting other parts of the tree, and vice-versa.


I am changing the color of the text in the header of my 'tips' page, with a transition. This takes a long time. Maybe the browser is looking through the large body.


There are more tips at: bbingo.xyz/t

 

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