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

ResizeObserver: unobserve() method - Web APIs

Baseline Widely available

The unobserve() method of the ResizeObserver interface ends the observing of a specified Element or SVGElement.

target

A reference to an Element or SVGElement to be unobserved.

None (undefined).

None.

The following snippet is taken from the resize-observer-text.html (see source) example:

const resizeObserver = new ResizeObserver((entries) => {
  for (const entry of entries) {
    if (entry.contentBoxSize) {
      // Checking for chrome as using a non-standard array
      if (entry.contentBoxSize[0]) {
        h1Elem.style.fontSize = `${Math.max(
          1.5,
          entry.contentBoxSize[0].inlineSize / 200,
        )}rem`;
        pElem.style.fontSize = `${Math.max(
          1,
          entry.contentBoxSize[0].inlineSize / 600,
        )}rem`;
      } else {
        h1Elem.style.fontSize = `${Math.max(
          1.5,
          entry.contentBoxSize.inlineSize / 200,
        )}rem`;
        pElem.style.fontSize = `${Math.max(
          1,
          entry.contentBoxSize.inlineSize / 600,
        )}rem`;
      }
    } else {
      h1Elem.style.fontSize = `${Math.max(
        1.5,
        entry.contentRect.width / 200,
      )}rem`;
      pElem.style.fontSize = `${Math.max(1, entry.contentRect.width / 600)}rem`;
    }
  }
  console.log("Size changed");
});

resizeObserver.observe(divElem);

checkbox.addEventListener("change", () => {
  if (checkbox.checked) {
    resizeObserver.observe(divElem);
  } else {
    resizeObserver.unobserve(divElem);
  }
});

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