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The article links to this browser test page:

http://www.ericbrasseur.org/gamma_dalai_lama.html

On my machine, both Firefox and Chrome display grey rectangles when scaling down. Why do the browsers get this wrong?

Because resizing in a linear colorspace is more costly. JPEG can be resized without shifting colorspaces VERY cheaply, but requires loading into RAM if a change in colorspace (or gamma shift) is performed. The hit can be quite significant. On a phone or laptop it would hurt battery, on an online service (dynamic resizer service) it would impact latency.

> on an online service (dynamic resizer service) it would impact latency.

If its even possible at all. Sometimes users upload things like https://commons.wikimedia.org/wiki/File:“Declaration_of_vict...

Can also depend on the monitor? When I drag this page between monitors I see different effects.

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