getPropertyValue gives wrong value when getting hex alpha color notation

[sandymcfadden]

Describe the bug

In browsers when you use style.getPropertyValue("background-color") when that color uses hex alpha notation it returns an rgba color.

When using happy-dom it returns the hex alpha notation string instead.

To Reproduce
Steps to reproduce the behavior:

1. Run git clone https://github.com/sandymcfadden/happy-dom-hex-alpha-color-notation.git
2. Run npm install
3. Run node src/index.js

Expected behavior
To match browsers and log the rgba color string

Screenshots
If applicable, add screenshots to help explain your problem.

Device:

• Node.js: v20.11.0
• happy-dom: 14.7.1