querySelector

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document.querySelector('h1') returns the first match or null.

What does querySelector return when nothing matches?

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const el = document.createElement('h1');
el.id='t'; document.body.appendChild(el);
console.log(document.querySelector('#t') ? 'found':'no');

JavaScript 1 automatic check The DOM

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const el = document.createElement('h1');
el.id='t'; document.body.appendChild(el);
console.log(document.querySelector('#t') ? 'found':'no');

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