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Only IE still honors overflow rules on the html element. try changing
html{
-ms-overflow-style: -ms-autohiding-scrollbar;
}
to
body{
-ms-overflow-style: -ms-autohiding-scrollbar;
}
To determine which Emulation mode IE11 is using in your development environment use the Emulation tab of the f12 dev tool.
If you are upgrading an old application to the newer framework, remove any presentation attributes (align, scroll, background etc) from the html tag.
Source:stackexchange.com