cache-polyfill
cache-polyfill is a JavaScript function in the DOM category. Checks if a cache exists. The syntax is caches.has(name). A typical example: const exists = await caches.has("v1"). A close sibling is document.getElementById(), which returns the element with the specified ID. A close sibling is document.querySelector(), which returns the first matching element. A close sibling is document.querySelectorAll(), which returns all matching elements as a NodeList. A close sibling is element.addEventListener(), which attaches an event handler. More about this category: DOM methods for interacting with HTML elements. Related DOM methods: document.getElementById(), document.querySelector(), document.querySelectorAll(), element.addEventListener(), element.removeEventListener(), document.createElement(), element.appendChild(), element.removeChild(). This page is part of the free JS Reference documentation covering 1027+ methods, each with syntax, parameters, return values, examples, and common pitfalls. You can try cache-polyfill immediately in the JavaScript playground, look up unfamiliar terms in the glossary, or return to the JS Reference homepage.