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Showing content from https://github.com/AngleSharp/AngleSharp/issues/1184 below:

Link element source not loaded when element is appended to document · Issue #1184 · AngleSharp/AngleSharp · GitHub

Prerequisites

Can you reproduce the problem in a MWE?
Are you running the latest version of AngleSharp?
Did you check the FAQs to see if that helps you?
Are you reporting to the correct repository? (there are multiple AngleSharp libraries, e.g., AngleSharp.Css for CSS support)
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Description

When setting up the BrowsingContext with the default resource loader and loading an HTML document it loads any link elements with stylesheets just fine. But when appending any new link elements to the document they do not get loaded as expected.

Steps to Reproduce

var config = Configuration.Default
                .WithCss()
                .WithDefaultLoader(new LoaderOptions() { IsResourceLoadingEnabled = true });

var html = @"<!doctype html><body></body>";

var document = BrowsingContext.New(config).OpenAsync(m => m.Content(html));

var link = document.CreateElement("link");
link.SetAttribute(AttributeNames.Rel, "stylesheet");
link.SetAttribute(AttributeNames.Href, "/mock-stylesheet.css");

document.Body.AppendChild(link);

Expected Behavior

The newly added link element's source should be loaded by the default resource loader (and in this case the CSS stylesheet should be parsed).

Actual Behavior

The link element is added to the document, but no request is made for the link's href URL.

Possible Solution / Known Workarounds

I have a PR ready for this with a fix.

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