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function selectText(selection) {
var range = selection.getRangeAt(0);
function replaceRange(s, start, end, substitute) {
return s.substring(0, start) + substitute + s.substring(end);
}
var text = selection.baseNode.textContent.substring(range.startOffset, range.endOffset);
var mark = `<mark>${text}</mark>`;
range.startContainer.parentElement.innerHTML = replaceRange(range.startContainer.textContent, range.startOffset, range.endOffset, mark);
}
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