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On this website, the blue button has the defined color #1E9AE2. In Safari and Firefox on macOS, this color is displayed as #449AE0:

In this screenshot, Safari is on the left, and Chrome to the right.

If I switch the following setting to "sRGB IEC61966-2.1", Safari and Firefox display it like the others too:

What's the reason for this difference?

Do all macOS computers have this setting as a default?

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The difference in color rendering is because of color profiles. Some browsers support color profiles, others don't. Embedding color profiles in your images will make their file sizes a bit larger, but will cause truer colors across browsers.

Please see:

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    The login button is no picture and consequently doesn't contain a profile! Instead it's probably defined in the css with: background-color: #1E9AE2; – klanomath Apr 7 '17 at 15:13
  • That second link explains it all (including CSS elements) under "Why tagging images for the web is not a complete answer?". In the end, it doesn't even matter. Everyone will have differently, and often ill-, configured displays. – Jules Apr 7 '17 at 15:19

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