AngleSharp by Florian Rappl

<PackageReference Include="AngleSharp" Version="0.8.7" />

.NET API 1,175,040 bytes

 HtmlDomBuilder

sealed class HtmlDomBuilder
Represents the Tree construction as specified in 8.2.5 Tree construction, on the following page: http://www.w3.org/html/wg/drafts/html/master/syntax.html
public HtmlDocument Parse(HtmlParserOptions options)

Parses the given source and creates the document.

public Task<HtmlDocument> ParseAsync(HtmlParserOptions options, CancellationToken cancelToken)

Parses the given source asynchronously and creates the document.

public HtmlDocument ParseFragment(HtmlParserOptions options, Element context)

Switches to the fragment algorithm with the specified context element. Then parses the given source and creates the document.