Why did WeChat Mini Programs use button::after {border: none;} to remove button borders

Why does WeChat Mini Programs use button::after {border: none;} to remove button borders
and button::after {border: none;}
is not seen on Wechat developer tools
Mar.28,2021
The

":: after" pseudo-element renders the new content after the element, which is not counted in the DOM tree and only changes the visual effect.
the default style of WeChat Mini Programs button is to add a border with:: after after rendering the button.
NT3Y(YK{1X%Q0C5[6]8LB)Y.png

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