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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/Selection/addRange below:

Selection: addRange() method - Web APIs

Baseline Widely available

The Selection.addRange() method adds a Range to a Selection.

range

A Range object that will be added to the Selection.

None (undefined).

Note: Currently only Firefox supports multiple selection ranges, other browsers will not add new ranges to the selection if it already contains one.

<p>
  I <strong>insist</strong> that you <strong>try</strong> selecting the
  <strong>strong words</strong>.
</p>
<button>Select strong words</button>

let button = document.querySelector("button");

button.addEventListener("click", () => {
  const selection = window.getSelection();
  const strongElems = document.getElementsByTagName("strong");

  if (selection.rangeCount > 0) {
    selection.removeAllRanges();
  }

  for (const node of strongElems) {
    const range = document.createRange();
    range.selectNode(node);
    selection.addRange(range);
  }
});

• Selection, the interface this method belongs to

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