Core Web Vitals
Core Web Vitals are three metrics Google uses to measure real-world page experience: Largest Contentful Paint (loading speed), Interaction to Next Paint (responsiveness) and Cumulative Layout Shift (visual stability). Good scores are an LCP of 2.5 seconds or less, an INP of 200 milliseconds or less and a CLS of 0.1 or less.
Example
A chat widget that loads a large script before the page renders can push LCP from 2.1 to 3.4 seconds, moving the page from "good" to "needs improvement".
Why it matters for a website chatbot
Third-party widgets are a common cause of slow pages. Check any chatbot's impact before installing. ChatBento's widget is about 6 KB compressed, loads asynchronously after your page and renders in a shadow DOM, keeping its effect on Core Web Vitals small.
See it in practice: Agency client sites
Related terms
- Chat widgetA chat widget is the small interface embedded on a website, usually a round button in a bottom corner, that opens a chat window when clicked. It connects visitors to a chatbot, live agents or both, and is normally added to a site with a short JavaScript snippet or a platform plugin.
- Script tagA script tag is the HTML <script> element, which loads or runs JavaScript on a web page. Third-party tools such as analytics, chat widgets and forms are commonly installed by pasting a one-line script tag into a site's code, often with async or defer attributes so it doesn't block the page from loading.
- Shadow DOMShadow DOM is a web standard that lets a component attach its own hidden, encapsulated tree of HTML elements to a page. Styles inside a shadow root don't leak out, and the page's styles don't leak in, so embedded components like widgets look the same on every site they're added to.