Onclick event executes JavaScript functions when buttons are clicked. Function name must match HTML tag name exactly. JavaScript functions can be written in separate files or HTML. Elements are selected using DOM methods like getElementById
HTML defines structure of web pages and is fundamental for web development. HTML alone is insufficient for appearance and interactivity. HTML, CSS, and JavaScript work together like human body components
Body element represents document content and has only one in conforming documents. Article element represents complete, independently distributable content. Section element represents thematic content groups with headings. Nav element contains links to other pages or within the page. Aside element represents tangential content separate from main content
HTML code can make pictures clickable with single line. Images offer larger clickable area than text. Links help direct traffic to websites effectively
HTTP status code 500 indicates unexpected server conditions preventing request fulfillment. Error can appear in various forms including blank screen or custom messages. Can significantly impact SEO if not fixed immediately
CSS determines website appearance and style. Modern templates use CSS3 with interactive features. Templates offer rounded corners, shadow effects, and colorful gradients