1614057 - Selection’s isCollapsed is set to false for a selection with multiple collapsed ranges

Status: UNCONFIRMED

(Core :: DOM: Selection, defect, P2)

Description

[aruseni]

Attachment: Screenshot from 2020-02-08 00-06-36.png

According to the spec, a selection’s isCollapsed must return true if the anchor and focus are the same. In Firefox, it is possible to add more than one range, and even if all ranges are collapsed, the selection’s isCollapsed is set to false, though its anchor and focus are the same.

Comment 1

[aruseni]

This page at MDN states that you actually can have such Selection object: multiple ranges, but with isCollapsed: true.

Comment 2

[Mirko Brodesser (:mbrodesser-Igalia), offline until April 25h]

Hi Aruseni, thanks for reporting the issue. This indeed violates the spec. Potentially the fix is simple (https://searchfox.org/mozilla-central/rev/a1592902acabf9bded973067133baaac1457f3d3/dom/base/Selection.h#272-274), but one will have to check potential side-effects.