I have tested this item ? unsuccessfully on 103e796

I tested this, although its now in the right place, (so maybe I should say this is a success?)

• it did not animate until I blurred by hitting ESC on my keyboard. Your screenshot shows it animating...
• Sometimes the overlay did not appear at all after pressing the button "check and install" until I blurred by pressing ESC on the keyboard

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@PhilETaylor It works fine on Firefox on windows. Can you share your system information?

This does not work, either with Macintosh safari or firefox or chrome

Here is an animated gif for Firefox macintosh.

Details of spinner placement

Detail of what is displayed briefly when install is almost done

EDIT: corrected test below

@PhilETaylor It works fine on Firefox on windows. Can you share your system information?

My primary testing is normally with with Safari on macOS.

I correct my test.

I had some issues with npm ci.
The patch is OK for Firefox and Chrome Macintosh.

Indeed I have an issue with Safari where the spinner does not animate.

@PhilETaylor
I also have an issue with WebInstaller and Safari-Macintosh (while no such issue with Chrome or Firefox.)

Currently working fine for me :)

I have tested this item ? unsuccessfully on 103e796

No animate on Mac-Safari, works on Mac-Firefox.

I have tested this item ✅ successfully on 103e796

Works fine on chrome..!!

This pull request has automatically rebased to 4.2-dev.

Is this pr already solved with the merge of #37570?

Yes, this seems to be solved with that PR, so I'm closing this one.