Resource keys

The themes read every colour, size and spacing of the document from resource keys, through DynamicResource, so redefining a key changes the open document at once. See Themes and presets for where to redefine them, and Theme presets for the values each preset sets.

Colours

MarkdownTheme.axaml defines its colours as SolidColorBrushes in its Light and Dark theme dictionaries. Colours are #AARRGGBB when translucent. The defaults meet WCAG 2.2 AA contrast; see Accessibility.

Resource key	Colours	Dark	Light
`MarkdownCodeBlockBackground`	Fenced and indented code blocks	`#1E1E1E`	`#F3F3F3`
`MarkdownCodeBlockForeground`	Code block text (before syntax highlighting); the copy icon under the pointer	`#D4D4D4`	`#1E1E1E`
`MarkdownCodeInlineBackground`	Inline code	`#1AFFFFFF`	`#0A000000`
`MarkdownCodeInlineForeground`	Inline code text	`#F4B49A`	`#A31515`
`MarkdownCodeHeaderBackground`	Code block toolbar	`#2D2D2D`	`#E4E4E4`
`MarkdownCodeHeaderForeground`	Toolbar language label and copy icon; a display formula's copy icon	`#A0A0A0`	`#5F5F5F`
`MarkdownCodeCopyButtonHoverBackground`	Copy button under the pointer	`#1AFFFFFF`	`#14000000`
`MarkdownCodeLineNumberForeground`	Code block line numbers	`#8A8A8A`	`#6A6A6A`
`MarkdownLinkForeground`	Links and footnote references	FluentTheme's `SystemAccentColorLight2`	FluentTheme's `SystemAccentColorDark2`
`MarkdownBlockquoteBorder`	Blockquote bar	`#4A9ECC`	`#2F7FB3`
`MarkdownTableBorder`	Table cell borders	`#6B6B6B`	`#8A8A8A`
`MarkdownAlertDefaultBorder`	Bar and title of alert kinds without their own colours (e.g. `[!QUESTION]`)	`#A1A1AA`	`#52525B`
`MarkdownAlertDefaultBackground`	Background of those alerts	`#1A71717A`	`#F4F4F5`
`MarkdownAlertNoteBorder`	`[!NOTE]` bar and title	`#3B82F6`	`#2563EB`
`MarkdownAlertNoteBackground`	`[!NOTE]` background	`#1A3B82F6`	`#EFF6FF`
`MarkdownAlertTipBorder`	`[!TIP]` bar and title	`#22C55E`	`#15803D`
`MarkdownAlertTipBackground`	`[!TIP]` background	`#1A22C55E`	`#F0FDF4`
`MarkdownAlertImportantBorder`	`[!IMPORTANT]` bar and title	`#A855F7`	`#9333EA`
`MarkdownAlertImportantBackground`	`[!IMPORTANT]` background	`#1AA855F7`	`#FAF5FF`
`MarkdownAlertWarningBorder`	`[!WARNING]` bar and title	`#EAB308`	`#A16207`
`MarkdownAlertWarningBackground`	`[!WARNING]` background	`#1AEAB308`	`#FEFCE8`
`MarkdownAlertCautionBorder`	`[!CAUTION]` bar and title	`#EF4444`	`#B91C1C`
`MarkdownAlertCautionBackground`	`[!CAUTION]` background	`#1AEF4444`	`#FEF2F2`
`MarkdownMarkedBackground`	Highlighted text (`==text==`)	`#5C4B00`	`#FFFF00`
`MarkdownKbdBackground`	`<kbd>` key background	`#151B23`	`#F6F8FA`
`MarkdownKbdForeground`	`<kbd>` key text	`#F0F6FC`	`#1F2328`
`MarkdownKbdBorder`	`<kbd>` key outline (thicker at the bottom)	`#6E7681`	`#818B98`

The theme also defines two StreamGeometry resources, the same in both variants: MarkdownCodeCopyIcon and MarkdownCodeCopiedIcon, the copy button's icons. A few colours are the same in both variants and sit outside the Light and Dark dictionaries: MarkdownTableHeaderBackground (#20808080), MarkdownFigureBorder and MarkdownThinkingBorder (#40808080), and MarkdownCodeBlockBorder, the outline of code blocks and their toolbar (Transparent, drawn only in high contrast unless a preset gives it a width). The dimming and outline widths that high contrast changes are keys too: MarkdownBlockquoteOpacity and MarkdownFootnoteOpacity (0.85), MarkdownFigureCaptionOpacity and MarkdownThinkingHeaderOpacity (0.75), MarkdownThinkingContentOpacity (0.8), MarkdownHeadingFoldOpacity (0.7), MarkdownCodeBlockBorderThickness and MarkdownCodeHeaderBorderThickness (0).

Images

Resource key	Dark	Light	Use
`MarkdownImageFailedForeground`	`#A1A1AA`	`#52525B`	Glyph and alt text of a failed image (AA on the page and on its background)
`MarkdownImageFailedBackground`	`#27272A`	`#F4F4F5`	Background of a failed image
`MarkdownImageFailedBorder`	`#7A7A83`	`#82828B`	Border of a failed image (3:1 on the page and on its background)
`MarkdownImageLightboxBackdrop`	`#E0000000`	`#CC000000`	Dimmed backdrop behind the zoomed image (`#CC000000` without the theme)
`MarkdownImageLightboxCloseForeground`	`#FFFFFF`	`#FFFFFF`	Cross of the close button
`MarkdownImageLightboxCloseBackground`	`#66000000`	`#66000000`	Close button
`MarkdownImageLightboxCloseHoverBackground`	`#33FFFFFF`	`#33FFFFFF`	Close button under the pointer

Find highlights

Find matches are drawn over the document by the selection overlay, not by a style class, so their colours come from these keys only. The highlight is opaque, and the text it covers is drawn again over it in its own colours; see Highlight colours for their contrast.

Resource key	Dark	Light	Use
`MarkdownFindMatchBackground`	`#453A00`	`#FFF176`	Every find match but the current one
`MarkdownFindCurrentMatchBackground`	`#652A00`	`#FFC584`	The current find match

Mermaid diagrams

Defined by the Mermaid package's MermaidTheme.axaml. The colours are baked into each diagram when it is drawn, and read again when the theme variant changes. Without the theme file, the same values are built in.

Resource key	Dark	Light
`MarkdownMermaidBackground`	`#18181B`	`#FFFFFF`
`MarkdownMermaidForeground`	`#FAFAFA`	`#27272A`
`MarkdownMermaidAccent`	`#60A5FA`	`#3B82F6`

High contrast

The MarkdownHighContrast* keys are the palette of the high-contrast mode; see High contrast.

Sizes and spacing

The control themes read their sizes and spacing from these keys, the same in both variants:

Resource key	Default	Used for
`MarkdownCodeFontFamily`, `MarkdownCodeFontSize`, `MarkdownCodeLineHeight`	Cascadia Code, Consolas, Courier New, monospace; 13; `NaN` (the font's own)	Code blocks (the font family also for inline code)
`MarkdownCodeBlockCornerRadius`, `MarkdownCodeBlockPadding`, `MarkdownCodeBlockMargin`	4; 12,8; 0,4	A code block without a toolbar
`MarkdownToolbarCodeBlockCornerRadius`, `MarkdownToolbarCodeBlockPadding`, `MarkdownToolbarCodeBlockBorderThickness`	0,0,4,4; 12,8; 0	A code block under its toolbar, which takes the top corners
`MarkdownCodeHeaderCornerRadius`, `MarkdownCodeHeaderPadding`	4,4,0,0; 12,2,4,2	The toolbar
`MarkdownCodeContainerMargin`, `MarkdownCustomFenceMargin`	0,4	A code block with its toolbar; a custom fenced block's control
`MarkdownMathContentMargin`	32,0	Room for a display formula's copy button on both sides
`MarkdownParagraphMargin`, `MarkdownParagraphLineSpacing`	0,2; 0	Paragraphs
`MarkdownListParagraphMargin`, `MarkdownTableParagraphMargin`, `MarkdownQuoteParagraphMargin`, `MarkdownAlertParagraphMargin`	0,2	Paragraphs in a list item, a table cell, a quote or an alert
`MarkdownTableParagraphLineSpacing`, `MarkdownAlertParagraphLineSpacing`	0	Line spacing in a table cell or an alert
`MarkdownListMargin`, `MarkdownNestedListMargin`	16,4,0,4	Lists, and lists inside a list item
`MarkdownTableMargin`, `MarkdownTableCellPadding`	0,4; 8,4	Tables
`MarkdownTableCellBorderThickness`, `MarkdownTableFirstRowCellBorderThickness`, `MarkdownTableFirstColumnCellBorderThickness`, `MarkdownTableCornerCellBorderThickness`	0,0,1,1	Cell borders: each cell draws its right and bottom ones, and those of the first row and column can add the top and left ones
`MarkdownTableHeaderFontWeight`	Bold	The header row
`MarkdownAlertCornerRadius`, `MarkdownAlertPadding`, `MarkdownAlertMargin`	0,4,4,0; 12,8; 0,4	Alerts (their bar is `MarkdownAlertBorderThickness`, 4,0,0,0)
`MarkdownAlertHeaderFontWeight`, `MarkdownAlertHeaderFontSize`, `MarkdownAlertHeaderMargin`	SemiBold; 13; 0,0,0,4	Alert titles
`MarkdownDetailsMargin`, `MarkdownDefinitionMargin`	0,4; 24,0,0,0	`<details>` blocks; definitions
`MarkdownCustomContainerCornerRadius`, `MarkdownCustomContainerMargin`	4; 0,4	Custom containers

Text

The labels of the context menu are string resources, listed under Context menu. The tooltips and accessible names of buttons (copy, lightbox, fold) come from the theme's styles; see Code blocks and Images and diagrams.