Supported HTML Subset▲
Qt's text widgets are able to display rich text, specified using a subset of HTML 4 markup. Widgets that use QTextDocument, such as QLabel and QTextEdit, are able to display rich text specified in this way.
Using HTML Markup in Text Widgets▲
Widgets automatically detect HTML markup and display rich text accordingly. For example, setting a label's text property with the string "<b>Hello</b> <i>Qt!</i>" will result in the label displaying text like this: Hello Qt!
When HTML markup is used for text, Qt follows the rules defined by the HTML 4 specification. This includes default properties for text layout, such as the direction of the text flow (left-to-right) which can be changed by applying the dir attribute to blocks of text.
Supported Tags▲
| Tag | Description | Comment | 
|---|---|---|
| a | Anchor or link | Supports the href and name attributes. | 
| address | Address | |
| b | Bold | |
| big | Larger font | |
| blockquote | Indented paragraph | |
| body | Document body | Supports the bgcolor attribute, which can be a Qt color name or a #RRGGBB color specification. | 
| br | Line break | |
| center | Centered paragraph | |
| cite | Inline citation | Same as i. | 
| code | Code | Same as tt. | 
| dd | Definition data | |
| dfn | Definition | Same as i. | 
| div | Document division | Supports the standard block attributes. | 
| dl | Definition list | Supports the standard block attributes. | 
| dt | Definition term | Supports the standard block attributes. | 
| em | Emphasized | Same as i. | 
| font | Font size, family, and/or color | Supports the following attributes: size, face, and color (Qt color names or #RRGGBB). | 
| h1 | Level 1 heading | Supports the standard block attributes. | 
| h2 | Level 2 heading | Supports the standard block attributes. | 
| h3 | Level 3 heading | Supports the standard block attributes. | 
| h4 | Level 4 heading | Supports the standard block attributes. | 
| h5 | Level 5 heading | Supports the standard block attributes. | 
| h6 | Level 6 heading | Supports the standard block attributes. | 
| head | Document header | |
| hr | Horizontal line | Supports the width attribute, which can be specified as an absolute or relative (%) value. | 
| html | HTML document | |
| i | Italic | |
| img | Image | Supports the src, source (for Qt 3 compatibility), width, and height attributes. | 
| kbd | User-entered text | |
| meta | Meta-information | If a text encoding is specified using the meta tag, it is picked up by Qt::codecForHtml(). Likewise, if an encoding is specified to QTextDocument::toHtml(), the encoding is stored using a meta tag, for example: <meta http-equiv="Content-Type" content="text/html; charset=EUC-JP" /> | 
| li | List item | |
| nobr | Non-breakable text | |
| ol | Ordered list | Supports the standard list attributes. | 
| p | Paragraph | Left-aligned by default. Supports the standard block attributes. | 
| pre | Preformated text | |
| qt | Qt rich-text document | Synonym for html. Provided for compatibility with earlier versions of Qt. | 
| s | Strikethrough | |
| samp | Sample code | Same as tt. | 
| small | Small font | |
| span | Grouped elements | |
| strong | Strong | Same as b. | 
| sub | Subscript | |
| sup | Superscript | |
| table | Table | Supports the following attributes: border, bgcolor (Qt color names or #RRGGBB), cellspacing, cellpadding, width (absolute or relative), and height. | 
| tbody | Table body | Does nothing. | 
| td | Table data cell | Supports the standard table cell attributes. | 
| tfoot | Table footer | Does nothing. | 
| th | Table header cell | Supports the standard table cell attributes. | 
| thead | Table header | If the thead tag is specified, it is used when printing tables that span multiple pages. | 
| title | Document title | The value specified using the title tag is available through QTextDocument::metaInformation(). | 
| tr | Table row | Supports the bgcolor attribute, which can be a Qt color name or a #RRGGBB color specification. | 
| tt | Typewrite font | |
| u | Underlined | |
| ul | Unordered list | Supports the standard list attributes. | 
| var | Variable | Same as i. | 
Block Attributes▲
The following attributes are supported by the div, dl, dt, h1, h2, h3, h4, h5, h6, p tags:
- 
						align (left, right, center, justify) 
- 
						dir (ltr, rtl) 
List Attributes▲
The following attribute is supported by the ol and ul tags:
- 
						type (1, a, A, square, disc, circle) 
Table Cell Attributes▲
The following attributes are supported by the td and th tags:
- 
						width (absolute, relative, or no-value) 
- 
						bgcolor (Qt color names or #RRGGBB) 
- 
						colspan 
- 
						rowspan 
- 
						align (left, right, center, justify) 
- 
						valign (top, middle, bottom) 
CSS Properties▲
The following table lists the CSS properties supported by Qt's rich text engine:
| Property | Values | Description | 
|---|---|---|
| background-color | <color> | Background color for elements | 
| background-image | <uri> | Background image for elements | 
| color | <color> | Text foreground color | 
| font-family | <family name> | Font family name | 
| font-size | [ small | medium | large | x-large | xx-large ] | <size>pt | <size>px | Font size relative to the document font, or specified in points or pixels | 
| font-style | [ normal | italic | oblique ] | |
| font-weight | [ normal | bold | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 ] | Specifies the font weight used for text, where normal and bold are mapped to the corresponding QFont weights. Numeric values are 8 times the equivalent QFont weight values. | 
| text-decoration | none | [ underline || overline || line-through ] | Additional text effects | 
| font | [ [ <'font-style'> || <'font-weight'> ]? <'font-size'> <'font-family'> ] | Font shorthand property | 
| text-indent | <length>px | First line text indentation in pixels | 
| white-space | normal | pre | nowrap | pre-wrap | Declares how whitespace in HTML is handled. | 
| margin-top | <length>px | Top paragraph margin in pixels | 
| margin-bottom | <length>px | Bottom paragraph margin in pixels | 
| margin-left | <length>px | Left paragraph margin in pixels | 
| margin-right | <length>px | Right paragraph margin in pixels | 
| padding-top | <length>px | Top table cell padding in pixels | 
| padding-bottom | <length>px | Bottom table cell padding in pixels | 
| padding-left | <length>px | Left table cell padding in pixels | 
| padding-right | <length>px | Right table cell padding in pixels | 
| padding | <length>px | Shorthand for setting all the padding properties at once. | 
| vertical-align | baseline | sub | super | middle | top | bottom | Vertical text alignment. For vertical alignment in text table cells only middle, top, and bottom apply. | 
| border-collapse | collapse | separate | Border Collapse mode for text tables. If set to collapse, cell-spacing will not be applied. | 
| border-color | <color> | Border color for text tables and table cells. | 
| border-top-color | <color> | Top border color for table cells. | 
| border-bottom-color | <color> | Bottom border color for table cells. | 
| border-left-color | <color> | Left border color for table cells. | 
| border-right-color | <color> | Right border color for table cells. | 
| border-style | none | dotted | dashed | dot-dash | dot-dot-dash | solid | double | groove | ridge | inset | outset | Border style for text tables and table cells. | 
| border-top-style | <border-style> | Top border style for table cells. | 
| border-bottom-style | <border-style> | Bottom border style for table cells. | 
| border-left-style | <border-style> | Left border style for table cells. | 
| border-right-style | <border-style> | Right border style for table cells. | 
| border-width | <width>px | Width of table or cell border | 
| border-top-width | <length>px | Top border width for table cells. | 
| border-bottom-width | <length>px | Bottom border width for table cells. | 
| border-left-width | <length>px | Left border width for table cells. | 
| border-right-width | <length>px | Right border width for table cells. | 
| border-top | <width>px <border-style> <border-color> | Shorthand for setting top border width, style and color | 
| border-bottom | <width>px <border-style> <border-color> | Shorthand for setting bottom border width, style and color | 
| border-left | <width>px <border-style> <border-color> | Shorthand for setting left border width, style and color | 
| border-right | <width>px <border-style> <border-color> | Shorthand for setting right border width, style and color | 
| border-top | <width>px <border-style> <border-color> | Shorthand for setting top border width, style and color | 
| border-bottom | <width>px <border-style> <border-color> | Shorthand for setting bottom border width, style and color | 
| border | <width>px <border-style> <border-color> | Shorthand for setting all four border's width, style and color | 
| background | [ <'background-color'> || <'background-image'> ] | Background shorthand property | 
| page-break-before | [ auto | always ] | Make it possible to enforce a page break before the paragraph/table | 
| page-break-after | [ auto | always ] | Make it possible to enforce a page break after the paragraph/table | 
| float | [ left | right | none ] | Specifies where an image or a text will be placed in another element. Note that the float property is only supported for tables and images. | 
| text-transform | [ uppercase | lowercase ] | Select the transformation that will be performed on the text prior to displaying it. | 
| font-kerning | [ normal | none ] | Enables or disables kerning between text characters. | 
| font-variant | small-caps | Perform the smallcaps transformation on the text prior to displaying it. | 
| word-spacing | <width>px | Specifies an alternate spacing between each word. | 
| line-height | <number>[% | px | pt | cm] | Specifies the height of a line. It can be one of the following: 
 | 
Qt-specific CSS properties▲
Besides the standard CSS properties listed earlier, the following Qt-specific properties can also be used to style a text block:
| Property | Values | Description | 
|---|---|---|
| -qt-block-indent | <number> | Indents the text block by the specified no. spaces. | 
| -qt-list-indent | <number> | Indents the list items by the specified no. of spaces. | 
| -qt-list-number-prefix | <string> | Prefixes the given string to list number in an HTML ordered list. | 
| -qt-list-number-suffix | <string> | Suffixes the given string to list number in an HTML ordered list. | 
| -qt-paragraph-type | empty | Hides the text block. | 
| -qt-table-type | root | frame | root renders the text blocks inline without borders and indentation, whereas frame renders them on a new line with a frame around. | 
| -qt-user-state | <number> | Adds it as user data for the text block. | 
Supported CSS Selectors▲
All CSS 2.1 selector classes are supported except pseudo-class selectors such as :first-child, :visited and :hover.




