Style gets removed from headers

[kosmakoff]

Whichever configuration I try - style attributes get removed from headers, i.e. h1 - h6.

Does anybody know what's the point and how to prevent it?

UPDATE: code to reproduce the issue:

using AngleSharp.Html;
using Ganss.Xss;

var html = "<h1 style=\"text-align:start;\">Title</h1>";

var options = new HtmlSanitizerOptions()
{
    AllowedTags =
    {
        "h1",
    },
    AllowedAttributes =
    {
        "style"
    },
    AllowedCssProperties =
    {
        "text-align"
    }
};

var sanitizer = new HtmlSanitizer(options);

var sanitizedHtml = sanitizer.Sanitize(html, outputFormatter: new PrettyMarkupFormatter());

Console.WriteLine(sanitizedHtml);

Expected output: <h1 style=\"text-align:start;\">Title</h1>.

Actual output: <h1>Title</h1>.

[kosmakoff]

Answering to myself: This library has nothing to do with the removal of this style, instead it is outdated AngleSharp.Css dependency that does not recognize text-align: start, specifically the start part.

Currently it works with beta version of nuget 9.1.878-beta (newer version do not work with .NET 6 at the time of writing).

[mganss]

Perhaps you can try the prerelease version of HtmlSanitizer, in practice it's as stable as the current release but depends on newer versions of AngleSharp and AngleSharp.Css.