How a browser draws a page: tree, style, layout, paint

How a browser draws a page: tree, style, layout, paint

Four steps turn code into the page you see.

The browser reads the HTML into a tree of tags. CSS rules give each one its look, and anything set to display none is cut. Layout works out every box's size, then paint fills the screen with pixels.

Save it for the next time a page loads slowly.

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