У вашего броузера проблема в совместимости с HTML5
How to Change Taskbar Color on Windows 10?
Step 1: Type 'Settings' in search Box, and click to open it.
Step 2: Click on 'Personalization'.
Step 3: Click on 'Colors'.
Step 4: If you have 'Automatically pick an accent color from my background' enable, click on it to disable it.
Step 5: Scroll down and enable this option Start, taskbar, and accent center under 'Show accent color on the following surfaces.'
Step 6: Now, Go above and choose color of your choice, you will see color of your taskbar changed.
It's Done
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