Highlight the current navigation link with JavaScript
Match same-site navigation paths with native JavaScript and mark the current page with an active class and aria-current.
Open Code ByteFind duplicate values with a JavaScript Map
Count exact duplicate IDs in one pass, preserve meaningful leading zeroes and show a readable result without constructing selectors from input.
Open Code ByteValidate a numeric input without blocking typing
Let people type, paste and edit normally, then validate a clearly defined decimal format with accessible feedback and server-side checks.
Open Code ByteCount down to a date with plain JavaScript
Build an independent countdown with an explicit UTC deadline, a finished state, start/pause controls and cleanup instead of shared timer state.
Open Code ByteReveal an element on scroll with Intersection Observer
Add a short, once-only entrance when an element reaches the viewport, with visible content by default and a reduced-motion fallback.
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