What are jQuery selectors?

<div id="main"><p class="note">A</p><p class="note">B</p><a href="/x">Link</a></div>

console.log($('#main').length);
console.log($('.note').length);
console.log($('p').length);
console.log($('a[href]').length);
console.log($('#main > p').length);

See jQuery Selectors.

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