How to build webapps that scale
In my demo, the holy grail layout is nested inside a document, so there's no body or main tags like shown above. Regardless, we're interested in the class names and the appearance of sections in the markup as opposed to the actual elements themselves. In particular, take note of the modifier classes used on the two sidebars, and the trivial order in which they appear in the markup. Let's break this down to paint a clear picture of what's happening...
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