4 examples of 'queryselector attribute' in JavaScript

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querySelector: function querySelector() {
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  return null;
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},

16
export function attribute (node: Node, selector: TSQuerySelectorNode): boolean {
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    const obj: any = getPath(node, selector.name);
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    // Bail on undefined but *not* if value is explicitly `null`:
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    if (obj === undefined) {
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        return false;
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    }
23
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    const { operator } = selector;
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    if (operator == null) {
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        return obj != null;
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    }
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    const { type, value } = selector.value as TSQuerySelectorNode;
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    const matcher = OPERATOR[operator];
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    if (matcher) {
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        return matcher(obj, value, type);
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    }
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    return false;
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}

26
querySelector() {
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  return {
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    firstChild: {
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      textContent: 'a',
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    },
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  };
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}

18
function querySelector(elementLocator, documentLocator)
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{
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    var docElement;
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    if (documentLocator) docElement = document.querySelector(documentLocator);
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    else docElement = document;
23
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    return docElement.querySelector(elementLocator);
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}