var() : CSS Variable Reference

Summary

Generate a CSS var() expression to reference CSS custom properties (variables). Allows dynamic CSS variable references with optional fallback values.

Signature

var(variableName)
var(variableName, fallbackValue)

Parameters

Returns

Type: String

A formatted CSS var() expression string.

Examples

Simple Variable Reference

<div style="color: ; background: ;">
  <p>Styled with CSS variables</p>
</div>

Data:

doc.Params["model"] = new { };

Output:

<div style="color: var(--primary-color); background: var(--bg-color);">
  <p>Styled with CSS variables</p>
</div>

Variable with Fallback

<p style="color: ;">
  Text with fallback color
</p>

Data:

doc.Params["model"] = new { };

Output:

<p style="color: var(--text-color, #333333);">
  Text with fallback color
</p>

Dynamic Variable Names

  <div style="background: ;">
    <p style="color: ;">
       theme
    </p>
  </div>

Data:

doc.Params["model"] = new {
    themes = new[] {
        new { name = "light" },
        new { name = "dark" }
    }
};

Output:

<div style="background: var(--light-bg);">
  <p style="color: var(--light-text);">
    light theme
  </p>
</div>
<div style="background: var(--dark-bg);">
  <p style="color: var(--dark-text);">
    dark theme
  </p>
</div>

Themed Components

<div class="card" style="
  border-color: ;
  background: ;
  padding: ;
">
  <h3 style="color: ;">
    
  </h3>
  <p style="color: ;">
    
  </p>
</div>

Data:

doc.Params["model"] = new {
    title = "Card Title",
    content = "Card content with CSS variables for theming."
};

Output:

<div class="card" style="
  border-color: var(--card-border, #cccccc);
  background: var(--card-bg, #ffffff);
  padding: var(--card-padding, 10pt);
">
  <h3 style="color: var(--card-heading-color, #000000);">
    Card Title
  </h3>
  <p style="color: var(--card-text-color, #333333);">
    Card content with CSS variables for theming.
  </p>
</div>

Responsive Sizing

<table style="width: ; font-size: ;">
  <tr>
    <th style="padding: ;">Header</th>
  </tr>
  <tr>
    <td style="padding: ;">Data</td>
  </tr>
</table>

Data:

doc.Params["model"] = new { };

Output:

<table style="width: var(--table-width, 100%); font-size: var(--table-font-size, 10pt);">
  <tr>
    <th style="padding: var(--cell-padding, 5pt);">Header</th>
  </tr>
  <tr>
    <td style="padding: var(--cell-padding, 5pt);">Data</td>
  </tr>
</table>

Notes

• Automatically adds -- prefix to variable names
• Returns a formatted var() string for CSS properties
• Fallback value is optional but recommended
• CSS variables must be defined in a stylesheet or inline style
• Variable names are case-sensitive
• Useful for:
  • Theme systems
  • Consistent styling
  • Responsive design
  • Brand color management
  • Reusable style tokens
• Variables can reference other variables
• Fallback provides graceful degradation
• Common naming conventions:
  • Colors: primary-color, secondary-color, text-color
  • Spacing: spacing-sm, spacing-md, spacing-lg
  • Fonts: font-heading, font-body, font-size-base
• Not all PDF rendering engines fully support CSS custom properties
• Consider providing fallbacks for better compatibility

See Also

• calc Function
• concat Function
• if Function