Where does CssDeclaration live in the IronPDF API?

CssDeclaration is a class in the IronPdf namespace, shipped in IronPdf.dll. It derives from Object and holds the Property, Value, and IsImportant components of a single parsed CSS declaration.

How do you use CssDeclaration to modify a CSS rule before rendering a PDF?

Construct a CssDeclaration with the default constructor, then set Property to the CSS property name, Value to the desired value string, and IsImportant to true or false. Pass the populated record into the rendering pipeline before generating the PDF.

Class CssDeclaration

Represents a parsed CSS declaration with its components

Inheritance

System.Object

CssDeclaration

Namespace: IronPdf

Assembly: IronPdf.dll

Syntax

public class CssDeclaration : Object

Parsed CSS declarations become inspectable, editable records through CssDeclaration, giving you direct access to the property name, value, and importance flag that make up a single CSS rule component. When IronPDF parses a stylesheet, each declaration is surfaced as a CssDeclaration instance so that code can read or rewrite styles before rendering a PDF.

Three properties carry the declaration's data. Property holds the CSS property name as a string, for example "font-size" or "color". Value holds the corresponding value string, such as "14pt" or "#333333". IsImportant is a bool that reflects whether the declaration carries the !important annotation, letting you detect or enforce priority rules programmatically. The default constructor CssDeclaration() creates a blank record that you can populate before passing it into a rendering pipeline.

A typical use is inspecting or patching declarations that a CSS parser has already produced. You read Property to identify the rule, check IsImportant to decide whether to override it, and write a new string to Value to apply the change before the PDF renderer consumes the stylesheet.

var decl = new CssDeclaration
{
    Property = "font-size",
    Value    = "12pt",
    IsImportant = false
};

For broader context on controlling PDF appearance through stylesheets, see the IronPDF HTML-to-PDF how-to and the CSS styling examples.

Constructors

CssDeclaration()

Declaration

public CssDeclaration()

Properties

IsImportant

Whether the declaration has the !important flag

Declaration

public bool IsImportant { get; set; }

Property Value

Type	Description
System.Boolean

Property

The CSS property name

Declaration

public string Property { get; set; }

Property Value

Type	Description
System.String

Value

The CSS property value

Declaration

public string Value { get; set; }

Property Value

Type	Description
System.String