From 743c431e227b49c64b0399283da4a44657bf5a3a Mon Sep 17 00:00:00 2001
From: David Awogbemila Document
document:
Let scrollers be a list of every element which is a shadow-including descendant of document +
Let scrollers be a list of every element which is a + flat tree descendant of document and establishes a scrolling box.