How do you insert an alert script in HTML?

1. How developers usually add a browser alert — the simplest path that still surprises people

Web developers most commonly insert alerts by placing JavaScript inside a in the document head or body, or attach functions like showAlert() to window.onload or button.onclick to control timing ^{[1] [2]}. This approach is universally supported by browsers and is the reason alert() remains a go‑to for quick dialogs and debugging, but authors note it interrupts user flow and should be used sparingly ^{[5] [6] [7]}.

2. When you want to show the script text rather than run it — escaping and encoding matter

If the goal is to display the literal text "" inside an input or on the page without executing it, you must prevent the HTML parser from treating the closing tag as the end of an active script element. Two commonly documented techniques are escaping the closing inside a JavaScript string (e.g., \"