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Adam-Mould/Check DOM for duplicate IDs

Created July 9, 2018 10:48
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Check DOM for duplicate IDs
Array.from(document.querySelectorAll('[id]'))
.map(domNode => domNode.id)
.filter((id, index, self) => id.length > 0 && self.indexOf(id) !== index)
.forEach(id => console.warn(`Multiple IDs #${id}`));
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