Some more context. I've run into this issue in UI.TextPrompt.moveCaretToEndOfPrompt (https://cs.chromium.org/chromium/src/third_party/WebKit/Source/devtools/front_end/ui/TextPrompt.js?q=TextPrompt.js+package:%5Echromium$&l=618) working on https://codereview.chromium.org/2646283002 . This method tries moving the caret to the end of content, but it may happen that the whole TextPrompt is currently detached from the DOM, causing 'The given range isn't in the document' error. I've tried swallowing the error and that's when I learned that I can't. There are other ways to avoid the problem, so this is not a big deal, but it wasn't obvious to me that what I see in the console isn't an exception raised by Selection.addRange.

No-exception is defined by the Selection API specification, and changing the specification for throwing would not be reasonable because no browsers throw at this moment.

What we should do:
 - Error -> Warning
 - Improve the message so that users can know it is shown by Selection.addRange.

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ada1a56e19efbc88c532ba3862d3ad1fa62ce3e1

commit ada1a56e19efbc88c532ba3862d3ad1fa62ce3e1
Author: Kent Tamura <tkent@chromium.org>
Date: Thu Nov 15 07:20:14 2018

Change the level of Selection.addRange failure message.

Error -> Warning.

Bug:  697443 
Change-Id: Ib4e88bb64cd5f1a533ae88306c47e91ca0606085
Reviewed-on: https://chromium-review.googlesource.com/c/1337216
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608284}
[modify] https://crrev.com/ada1a56e19efbc88c532ba3862d3ad1fa62ce3e1/third_party/WebKit/LayoutTests/editing/selection/addRange-failures-expected.txt
[modify] https://crrev.com/ada1a56e19efbc88c532ba3862d3ad1fa62ce3e1/third_party/blink/renderer/core/editing/dom_selection.cc
[modify] https://crrev.com/ada1a56e19efbc88c532ba3862d3ad1fa62ce3e1/third_party/blink/renderer/core/editing/dom_selection.h