In Google chrome they have a the copy styles button feature since V77

But can't figure out how to use it using the Browser's API

I have tried getComputedStyle but apparently the result is not what's expected (it has a more styles than needed)

If we compared the result of "Copy styles" available in google chrome dev tools GUI and the browser's getComputedStyle for a any element

After "copy styles" the result would look like this:

-webkit-font-smoothing: antialiased;    
-webkit-text-size-adjust: 100%;    
color: rgba(0,0,0,0.87);     
box-sizing: inherit;    
position: fixed;    
z-index: 1300;  
right: 0;
bottom: 0; 
top: 0; 
left: 0;

While getComputedStyles has a lot more than these styles (a whole lot more)

Where I expect to have another API that can copy css just like the "copy styles" button