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IE11 shows some kinda of emboss in panel-primary #16671
I've just been looking into this issue on IE11 on Windows 8.1. It is a bit jarring once you notice it.
Using the F12 DOM Explorer devtool and then turning off both 'border-top-left-radius:3px' and 'border-top-right-radius:3px' from .panel-heading fixes the issue and all the example panel headings looks great with no 1 pixel white inner border.
Confirming on behalf of the IE team that we see the issue in both Internet Explorer and Microsoft Edge. As @coliff stated above, turning off the border-radius values on
I've created a repro of this, confirming that the issue is a combination of a sized-width containing element, and the overall width of the window. Note the override of the second panel's rounded corners.