Loading content from a string truncates decimal percentages values in keyframes.

[mbce]

Bug Report

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)
• Did you perform a search in the issues?

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Description

First of all hello, and thank you very much for your wonderful library :)
I am having an issue with serializing HTML+CSS Content, as described in the title:

If I load an html string into a document (BrowsingContext.New(Configuration.Default.WithCss()), context.OpenAsync...) with a style tag in the head, describing different animations thanks to the @Keyframes rule, using decimal component in percentages (0.14% { ... } for instance), the decimal part of my keyframe percentage is removed as soon as I serialize this document again (document.ToHtml()).

According to CSS Documentation, percentages are numbers (https://www.w3.org/TR/css3-values/#percentages), so I suppose this integer conversion should not happen, am I wrong here ?
So, I looked at several places, the FAQ, documentation and so on, and I couldn't find something to help me, but if I missed it, I apologize in advance :)

Steps to Reproduce

1. Create an HTML document with style inside the head.
2. Create a keyframes rule with decimal component in the percentage values {@Keyframes 27.32% { ... } }
3. Take this HTML as a string
4. Load this string into an AngleSharp document, creating the context with css.
5. Serialize this document
6. Look at the obtained string

Expected behavior:
The serialized string should contain the same rule as the source, with the decimal percentage.

Actual behavior:
The serialized string has the percentage value truncated, removing its decimal component (it becomes {@Keyframes 27% { ... } })

Environment details:

• Windows 10 & Ubuntu
• .NET5 project
• AngleSharp 1.0.1
• AngleSharp.css 0.17.0

Possible Solution

I don't know, maybe the type used when parsing the value internally should be changed ?

Thank you very much :)