RichTextBox for UWP supports many HTML elements. The following table lists HTML elements by names and notes whether they are supported by RichTextBox for UWP.
| Name | Supported |
| A | YES |
| ABBR | YES |
| ACRONYM | YES |
| ADDRESS | YES |
| APPLET | NO |
| AREA | NO |
| B | YES |
| BASE | NO |
| BASEFONT | YES |
| BDO | NO |
| BIG | YES |
| BLOCKQUOTE | YES |
| BODY | YES |
| BR | YES |
| BUTTON | NO |
| CAPTION | NO |
| CENTER | YES |
| CITE | YES |
| CODE | YES |
| COL | YES |
| COLGROUP | YES |
| DD | YES |
| DEL | YES |
| DFN | YES |
| DIV | YES |
| DL | YES |
| DT | YES |
| EM | YES |
| FIELDSET | NO |
| FONT | YES |
| FORM | NO |
| FRAME | NO |
| FRAMESET | NO |
| H1 | YES |
| H2 | YES |
| H3 | YES |
| H4 | YES |
| H5 | YES |
| H6 | YES |
| HEAD | YES |
| HR | YES |
| HTML | YES |
| I | YES |
| IFRAME | NO |
| IMG | YES |
| INPUT | NO |
| INS | YES |
| ISINDEX | NO |
| KBD | YES |
| LABEL | YES |
| LEGEND | NO |
| LI | YES |
| LINK | NO |
| MAP | NO |
| MENU | YES |
| META | NO |
| NOFRAMES | NO |
| NOSCRIPT | NO |
| OBJECT | NO |
| OL | YES |
| OPTGROUP | NO |
| OPTION | NO |
| P | YES |
| PARAM | NO |
| PRE | YES |
| Q | NO |
| S | YES |
| SAMP | YES |
| SCRIPT | NO |
| SELECT | NO |
| SMALL | YES |
| SPAN | YES |
| STRIKE | YES |
| STRONG | YES |
| STYLE | YES |
| SUB | YES |
| SUP | YES |
| TABLE | YES |
| TBODY | YES |
| TD | YES |
| TEXTAREA | NO |
| TFOOT | YES |
| TH | YES |
| THEAD | YES |
| TITLE | NO |
| TR | YES |
| TT | YES |
| U | YES |
| UL | YES |
| VAR | YES |
