js

addRange(range)

html

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

js

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

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

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

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