DOM traversal and manipulation, events and bubbling, fetch, Web Storage, IntersectionObserver, service workers and the History API.
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- What does querySelector() return?
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The first element matching the CSS selector, or null if no match exists.- What is the difference between querySelector and querySelectorAll?
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querySelector returns one element, querySelectorAll returns a NodeList of all matching elements.- What does parentElement return?
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The parent node that is an Element, skipping any text or comment nodes.- What is the difference between children and childNodes?
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children returns only Element nodes, childNodes returns all node types including text and comment nodes.- What is the difference between nextSibling and nextElementSibling?
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nextSibling returns the next node of any type, nextElementSibling returns only the next Element node.- What does the closest() method do?
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Searches the element and its ancestors for the first element matching a CSS selector.- What does textContent return?
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The text content of an element and all its descendants, excluding any HTML markup.- What is the difference between textContent and innerText?
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innerText considers CSS visibility and returns only visible text, textContent ignores visibility.- What does innerHTML do?
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Sets or gets the HTML markup content of an element, including tags.- What does appendChild do?
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Adds a node as the last child of a parent element.- What does removeChild do?
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Removes a specified child node from the DOM.- What does insertBefore do?
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Inserts a node before a specified child node as a sibling.- What does replaceChild do?
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Replaces an existing child node with a new node.- What does cloneNode do?
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Creates a copy of a node, with an optional boolean to include all child nodes.- What does setAttribute do?
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Sets the value of an attribute on an element.
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