Returns a new Range object.
range = document.createRange();
range is the created Range object.
var range = document.createRange(); range.setStart(startNode, startOffset); range.setEnd(endNode, endOffset);
Once a Range is created, you need to set its boundary points before you can make use of most of its methods.
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https://developer.mozilla.org/en-US/docs/Web/API/document/createRange