Learn how to add maps to an HTML page: map links, static images, iframe embeds and interactive libraries, building an OpenStreetMap embed from coordinates, click-to-load for privacy, text alternatives with address and directions, keys and terms, accessibility, responsive sizing, and common mistakes, with live demos.
Learn secure HTML form design: never trusting the browser, server-side validation with allow-lists, HTTPS, escaping output to stop XSS, parameterised queries against SQL injection, CSRF tokens and SameSite cookies, safe password handling, rate limiting and bot defences, avoiding information leaks, safe file uploads, mass assignment, privacy and data minimisation, and a practical security checklist.
Learn how to keep a page safe when it embeds content you did not write: the risks of scripts, iframes and widgets, Content-Security-Policy, Subresource Integrity, iframe sandbox, Permissions-Policy, referrer and link rules, consent and privacy, click-to-load, auditing, and incident planning, with live demos.