const dupes = Object.entries(
[...document.querySelectorAll("[id]")]
.map((x) => x.id) /* get all ids */
.reduce(
(acc, id) => ({ ...acc, [id]: (acc[id] || 0) + 1 }),
{}
) /*count them*/
).filter(([_key, val]) => val > 1); /* find the ones repeating more than once */
console.warn(dupes);
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