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if (!document.caretRangeFromPoint){
document.caretRangeFromPoint = function polyfillcaretRangeFromPoint(x,y){
let range = document.createRange();
let position = document.caretPositionFromPoint(x,y);
if (!position) {
return null;
}
range.setStart(position.offsetNode, position.offset);
range.setEnd(position.offsetNode, position.offset);
return range;
};
}
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