inside region inside region inside region inside region word1 inside region inside region inside region inside region
inside region inside region inside region inside region word2 inside region inside region inside region inside region
outside region outside region outside region outside region outside region outside region outside region outside region

Bug #121841 - [CSS Regions] Layout Test for selecting text in 2 regions

This test checks the selection in 2 regions. If you select from word1 to word2 you will see that "outside region" text is not highlighted and not included in the selected content.

Selected content: