HTMLIFrameElement: srcdoc property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.

The srcdoc property of the HTMLIFrameElement specifies the content of the page.

const iframe = document.createElement("iframe");
iframe.srcdoc = `<!doctype html><p>Hello World!</p>`;
document.body.appendChild(iframe);

Specification
HTML Standard # dom-iframe-srcdoc

BCD tables only load in the browser