Node.firstChild

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JavaScript’s Node.firstChild read-only property returns the Node’s first child or null if the Node has no children.

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Element.hasAttributes()

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JavaScript’s Element.hasAttributes() method returns a Boolean value indicating whether the Element has any attributes or not.

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Element.hasAttribute()

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JavaScript’s Element.hasAttribute() method returns a Boolean value indicating whether the Element has a specified attribute or not.

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Element.removeAttribute()

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JavaScript’s Element.removeAttribute() method removes an attribute from the Element.

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Element.setAttribute()

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JavaScript’s Element.setAttribute() method sets the value of an attribute of the Element.

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Element.getAttribute()

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JavaScript’s Element.getAttribute() method returns the value of an attribute of the Element or null if the attribute does not exist.

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Element.closest()

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JavaScript’s Element.closest() method matches the Element and its ancestors against a CSS selector and returns the first matching element or null.

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Node.hasChildNodes()

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JavaScript’s Node.hasChildNodes() method returns a Boolean value indicating whether the Node has child nodes or not.

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Node.removeChild()

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JavaScript’s Node.removeChild() method removes a child node from the Node.

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Node.replaceChild()

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JavaScript’s Node.replaceChild() method replaces a child node within the Node.

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