Introducing "layout boundaries"
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"Layout" is the process a browser undergoes to calculate the position and size of each element in a document before it can start painting pixels. The process of layout can be costly, especially on low powered mobile devices.
There's so much stuff happening on the performance side of things these days, it's interesting to see from how many different angles this can be approached, whereas they all go together in the end. Thus, here's one more on performance optimization during "layout".