1640873 - Mouseenter not fired when mouse entered into element when page still loading (switching tabs)

Status: UNCONFIRMED

(Core :: DOM: UI Events & Focus Handling, defect, P3)

Description

[gwarser]

Attachment: simplescreenrecorder-2020-05-25_22.46.37.mp4

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0

Steps to reproduce:

• open two tabs with https://codepen.io/edgarchen-the-decoder/pen/ExVONrm
• right click in the tab bar on the tab of the page in background and select "Reload Tab"
• quickly move mouse to green box in visible tab
• quickly press Ctrl+W

trick is to switch to the second tab when it's still loading

Actual results:

mouseenter is not fired. If cursor is not moved outside green box even reloading by F5 does not fire mouseenter.

Expected results:

Good question. Chrome does not fire mouseenter immediately, but after mouse movement.

Comment 1

[gwarser]

If cursor is not moved outside green box even reloading by F5 does not fire mouseenter.

This part happens sporadically.