| Subject | Welsh | English |
| comp., MS | ffynhonnell HTML | HTML source (The unrendered HTML code including tags and syntax) |
| comp., MS | Gadael Ffynhonnell HTML | Exit HTML Source (An option that switches the view from the display of HTML source code to the display of Web page content) |
| comp., MS | HTML cyfoethog | rich HTML (HTML that includes markup for formatting such as backgrounds, borders, text fonts, styles and colors) |
| comp., MS | HTML wedi'i hidlo | filtered HTML (An HTML format with Microsoft Office-specific tags removed) |