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+---
+title: Typst property output
+author: Gordon Woodhull
+---
+
+Pandoc Typst property output
+============================
+
+For supported elements, the Pandoc Typst Writer outputs Typst properties for attributes with keys of the form `typst:prop` or `typst:text:prop`.
+
+
+Typst properties
+----------------
+
+[Typst](https://typst.app/) allows specification of visual and layout properties as parameters to elements
+
+```typst
+#block(fill=orange)[Hello]
+```
+
+and set-rules
+
+```typst
+#set text(fill=blue); Hello
+```
+
+The parameter values are [Typst code](https://typst.app/docs/reference/syntax/#modes) that can use any features of the Typst language.
+
+Pandoc Typst property output
+----------------------------
+
+For the set of supported Pandoc elements, the Pandoc Typst Writer will output attributes to corresponding Typst elements or set-text rules. 
+
+The attribute keys must be of the form `typst:prop` or `typst:text:prop` and the values must be raw Typst code.
+
+`prop` is the name of the property to set.
+
+The Typst Writer does not check the validity of `prop` or the value.
+
+For example, `pandoc -f html -t typst` with HTML input
+
+```html
+<div typst:inset="10pt">foo</div>
+```
+
+produces Typst output
+
+```typst
+#block(inset: 10pt)[
+foo
+]
+```
+
+and with HTML input
+
+```html
+<div typst:text:fill="purple">foo</div>
+```
+
+it produces Typst output
+
+```typst
+#block[
+#set text(fill: purple); foo
+]
+```
+
+
+
+Supported elements
+------------------
+
+The following Pandoc AST elements are currently supported. More may be supported in the future.
+
+- [Span](https://pandoc.org/lua-filters.html#type-span)
+
+  `typst:text:prop`
+
+  : The content is wrapped in a Typst [text element](https://typst.app/docs/reference/text/text/) with the specified properties set.
+
+- [Div](https://pandoc.org/lua-filters.html#type-div)
+
+  `typst:prop`
+
+  : The `prop` is output as a parameter to the Typst [block element](https://typst.app/docs/reference/layout/block/)
+
+  `typst:text:prop`
+
+  : The `prop` is output as a property in a set-text rule at the start of the block content.
+
+- [Table](https://pandoc.org/lua-filters.html#type-table)
+
+  `typst:prop`
+
+  : The `prop` is output as a parameter to the Typst [table element](https://typst.app/docs/reference/model/table/)
+
+  `typst:text:prop`
+
+  : The table is wrapped in a Typst [text element](https://typst.app/docs/reference/text/text/) with `prop` as one of its properties.
+
+- Table [Cell](https://pandoc.org/lua-filters.html#type-cell)
+
+  `typst:prop`
+
+  : The `prop` is output as a property on the Typst table [cell element](https://typst.app/docs/reference/model/table/#definitions-cell)
+
+  `typst:text:prop`
+
+  : The `prop` is output as a property in a set-text rule at the start of the cell content.
+
+
+Lua filter example
+------------------
+
+Here is a minimal example of a Lua filter which translates the CSS [color property](https://developer.mozilla.org/en-US/docs/Web/CSS/color) on a span element to the equivalent [fill parameter](https://typst.app/docs/reference/text/text/#parameters-fill) on a Typst text element.
+
+```lua
+function styleToTable(style)
+  local ret = {}
+  for clause in style:gmatch('([^;]+)') do
+    k,v = clause:match("([%w-]+)%s*:%s*(.*)$")
+    ret[k] = v
+  end
+  return ret
+end
+
+function Span(span)
+  local style = styleToTable(span.attributes['style'])
+  if not style then return end
+  if style['color'] then
+    span.attributes['typst:text:fill'] = style['color']
+  end
+  return span
+end
+```
+
+Given the HTML input
+
+```html
+<p>Here is some <span style="color:orange">orange text</span>.</p>
+```
+
+the command
+
+```sh
+quarto pandoc -f html -t typst --lua-filter ./typst-property-example.lua
+```
+
+will produce the Typst output
+
+```typst
+Here is some #text(fill: orange)[orange text].
+```
+
+Of course, this simple filter will only work for Typst's [predefined colors](https://typst.app/docs/reference/visualize/color/#predefined-colors). A more complete filter would need to translate the value as well.
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