Frontend 路 Intern to senior
HTML questions in interviews are rarely about tags alone. They test whether you understand how the browser loads, parses and renders a page, and how that affects accessibility and performance.
5 questions
Semantic elements describe their meaning in the name, such as header, nav, main, article and footer, so browsers, assistive technology and search engines can understand the page structure.
Cookies are sent to the server with every matching request and can expire; localStorage persists until cleared and stays in the browser; sessionStorage lasts for the current tab only.
Both download the script without blocking HTML parsing. defer waits until parsing finishes and runs scripts in document order; async runs a script as soon as it is downloaded, which can be before or after parsing and in any order.
The browser parses HTML into a DOM and CSS into a CSSOM, combines them into a render tree, computes layout (reflow), paints pixels and composites layers onto the screen.
Core Web Vitals are Google鈥檚 field metrics for real-user experience: LCP (loading), INP (interactivity) and CLS (visual stability). They influence search ranking and are measured on real devices, not only Lighthouse.