# HighlightStyle Enum

> Specifies the visual effect used when a link annotation is activated (clicked).

- Product: Adobe PDF Library 21
- Language: .NET Framework
- Version: APDFL21.0.0PlusP1e
- HTML page: https://docs.datalogics.com/apdfl21/DotNetFramework/APDFL21.0.0PlusP1e/enum/HighlightStyle
- Version index: https://docs.datalogics.com/apdfl21/DotNetFramework/APDFL21.0.0PlusP1e/llms.txt

**Namespace:** `Datalogics::PDFL`

## Description

Specifies the visual effect used when a link annotation is activated (clicked).

## Values

- `None = 0`: Do not highlight this link
- `Invert = 2`: Highlight by inverting the contents of the rectangle
- `Outline = 3`: Highlight by inverting the border
- `Push = 4`: Display the annotation as if it were being pushed below the page surface (like a button)
- `Toggle = 5`: Toggle: synonym for Push