An Add-on for Mozilla Firefox Download serialized DOM with a click, which should include changes within the page effected since loading e.g. by JavaScript. Built version ready to install from https://addons.mozilla.org/en-US/firefox/addon/download-serialized-dom/ . Made since Firefox 57 to replace the earlier Save Back to File from DOM https://addons.mozilla.org/en-US/firefox/addon/save-back-to-file-from-dom/ by using the newly constrained web extensions format. A couple nice SVG example files to try it out with are linked from http://srguiwiz.github.com/save-back-xpi/save-back-examples.html . Build with web-ext https://www.npmjs.com/package/web-ext .