html. HyperText Markup Language. HTML is a Web format file. HTML source code can be changed in a text editor. HTML files are being developed for future use in the users web browser, allowing you to format text, images and other materials required sites. 14 May 2015 Click to Download However, if you want to force the file to download, by prompting a download The 'force file download' code works perfectly in Chrome, but in Safari & Firefox,