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It’s easy to get the current selection with Javascript. It’s easy to select an entire node.

But what if you want to create a selection that spans multiple elements?

Easy (after a few hours of bumbling around, lol):

1. Select the text in the element where you want the block to start (I used window.find())
2. Save the start point in a range object with setStart
3. Repeat 1 & 2 with the end point, setting the end of the range object
4. Select the (multi-node) range object you just created with window.getSelection().addRange()

Get the code here.

Enjoy!