If you press the key combination Alt-Shift-Esc or right-click an empty area in the taskbar, you can launch the Task Manager ...

In the latest Beta version of Windows 11, there’s a new toggle in the Taskbar section of Windows Settings that lets you Show smaller taskbar buttons with options for Always, Never, and When ...

As uncovered by PhantomOfEarth in a beta build of Windows 11 (22635), there's going to be an option to have the taskbar icons made smaller - but this is hidden in the preview right now.

Save the icon in .ico or .png format. Be sure to save your icon in one of these formats to ensure compatibility with most browsers, including Google Chrome and Firefox. Upload the icon to your server.