Start learning HTML embedded content: iframe, embed, object, SVG, canvas, and maps. See what each element is for, how they differ, how to choose between them, and why third-party content needs security care, with a live sampler of four embedding methods.
Learn the HTML iframe element: embedding another page with src and srcdoc, titles for accessibility, size and aspect-ratio, lazy loading, the sandbox attribute, allow and referrerpolicy, why some sites refuse to be framed, and talking to a frame with postMessage, with live demos.
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 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.