This my code but there is an error if you override the highlighted text.
The error is:
Uncaught InvalidStateError: Failed to execute 'surroundContents' on 'Range': The Range has partially selected a non-Text node.
JS
function surroundSelection() {
var span = document.createElement("span");
span.setAttribute('class', 'hlt')
if (window.getSelection) {
var sel = window.getSelection();
if (sel.rangeCount) {
var range = sel.getRangeAt(0).cloneRange();
range.surroundContents(span);
sel.removeAllRanges();
sel.addRange(range);
}
}
}
Try this instead:
function surroundSelection() {
var selection= window.getSelection().getRangeAt(0);
var selectedText = selection.extractContents();
var span= document.createElement("span");
span.setAttribute('class', 'hlt')
span.appendChild(selectedText);
selection.insertNode(span);
}
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