The following sample code demonstrates how to access, list and modify attributes of the particular DOM element.

Note:

Element attributes cannot be used to modify element properties. The difference between attributes and properties is explained here:

http://stackoverflow.com/questions/6003819/properties-and-attributes-in-html

C#

using DotNetBrowser;
using DotNetBrowser.DOM;
using DotNetBrowser.Events;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DOMGetAttributesSample
{
    class Program
    {
        static void Main(string[] args)
        {
            Browser browser = BrowserFactory.Create();
            browser.FinishLoadingFrameEvent += delegate (object sender, FinishLoadingEventArgs e)
            {
                if (e.IsMainFrame)
                {
                    //Get the document
                    DOMDocument document = e.Browser.GetDocument();
                    //Get the element by its Id
                    DOMElement link = document.GetElementById("link");

                    //Get the attributes of the received element
                    Dictionary<String, String> attributes = link.Attributes;

                    //Print attributes
                    foreach (var attribute in attributes)
                    {
                        Console.WriteLine(attribute.Key + " = " + attribute.Value);                        
                    }

                    //Update the style attribute value
                    link.SetAttribute("style", "background-color: blue;");
                }
            };
            browser.LoadHTML("<html><body><a href='#' id='link' title='Link title' style='background-color: red;'></a></body></html>");
        }
    }
}

VB.NET

Imports System.Collections.Generic
Imports DotNetBrowser
Imports DotNetBrowser.DOM

Module Module1
    <STAThread>
    Sub Main()

        Dim browser As Browser = BrowserFactory.Create()

        AddHandler browser.FinishLoadingFrameEvent, Sub(o, e)
            If e.IsMainFrame Then
                'Get the document
                Dim document As DOMDocument = e.Browser.GetDocument()

                'Get the element by its Id
                Dim link As DOMElement = document.GetElementById("link")

                'Get the attributes of the received element
                Dim attributes As Dictionary(Of String, String) = link.Attributes

                'Print attributes
                For Each attribute In attributes
                    Console.WriteLine(attribute.Key + " = " + attribute.Value)
                Next

                'Update the style attribute value
                link.SetAttribute("style", "background-color: blue;")
            End If
        End sub
        browser.LoadHTML(
            "<html><body><a href='#' id='link' title='Link title' style='background-color: red;'></a></body></html>")
    End Sub
End Module