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• Add a skip link that lands on the main regionbeginner
• Add an event listener with the options you actually needbeginner
• Announce field errors without moving the caretintermediate
• Associate every form control with an explicit labelbeginner
• Build a card grid that reflows without media queriesintermediate
• Cancel an in-flight fetch with AbortControlleradvanced
• Centre an element with flexbox and no wrapper markupbeginner
• Create a two-column layout with a fixed sidebarintermediate
• Debounce a scroll handler without dropping the last callintermediate
• Define colour tokens for light and dark schemesintermediate
• Delegate events for a list that changes after loadintermediate
• Derive a running total during render instead of storing itintermediate
• Fetch JSON and separate a failed request from a failed statusbeginner
• Group array items by a computed keybeginner
• Group related checkboxes with a fieldset and legendintermediate
• Keep a table header visible with sticky positioningintermediate
• Lazy-load images with IntersectionObserverintermediate
• Mark up a primary navigation as a labelled listintermediate
• Memoise a derived value with typed dependenciesintermediate
• Narrow an unknown API response with type guardsintermediate
• Normalize an API payload into a typed listintermediate
• Reveal an element the first time it enters the viewportbeginner
• Structure a page with semantic landmarksbeginner
• Style a visible keyboard focus ring with custom propertiesbeginner
• Transform server records into the view model a component rendersintermediate
• Type a generic fetch hook that returns a known payloadadvanced
• Type a React context provider and its consumerintermediate
• Type the validation state of a controlled formadvanced
• Validate a controlled React form on submitintermediate
• Validate form input before the browser submits itbeginner