It will require API proposal for the C# side of the API.

runtime/src/libraries/System.Runtime.InteropServices.JavaScript/ref/System.Runtime.InteropServices.JavaScript.cs

Lines 300 to 311 in 061f153

    
           public void ToManaged(out Span<byte> value) { throw null; } 
        
           public void ToJS(Span<byte> value) { throw null; } 
        
           public void ToManaged(out ArraySegment<byte> value) { throw null; } 
        
           public void ToJS(ArraySegment<byte> value) { throw null; } 
        
           public void ToManaged(out Span<int> value) { throw null; } 
        
           public void ToJS(Span<int> value) { throw null; } 
        
           public void ToManaged(out Span<double> value) { throw null; } 
        
           public void ToJS(Span<double> value) { throw null; } 
        
           public void ToManaged(out ArraySegment<int> value) { throw null; } 
        
           public void ToJS(ArraySegment<int> value) { throw null; } 
        
           public void ToManaged(out ArraySegment<double> value) { throw null; } 
        
           public void ToJS(ArraySegment<double> value) { throw null; }

The JS side API design is not so formal and our team would do it on the PR review.

runtime/src/native/libs/Common/JavaScript/types/public-api.ts

Line 702 in 061f153

export interface IMemoryView extends IDisposable {

Other than that, I think the experience would be similar to ArraySegment because JS side would have to hold it pinned via GCHandleType.Pinned same as ArraySegment.

We probably want to do ReadOnlyMemory<T> at the same time.
Which would not have write functions on JS side and new public IReadOnlyMemoryView typescript interface.

	public void ToManaged(out Span<byte> value) { throw null; }
	public void ToJS(Span<byte> value) { throw null; }
	public void ToManaged(out ArraySegment<byte> value) { throw null; }
	public void ToJS(ArraySegment<byte> value) { throw null; }
	public void ToManaged(out Span<int> value) { throw null; }
	public void ToJS(Span<int> value) { throw null; }
	public void ToManaged(out Span<double> value) { throw null; }
	public void ToJS(Span<double> value) { throw null; }
	public void ToManaged(out ArraySegment<int> value) { throw null; }
	public void ToJS(ArraySegment<int> value) { throw null; }
	public void ToManaged(out ArraySegment<double> value) { throw null; }
	public void ToJS(ArraySegment<double> value) { throw null; }

Uh oh!

[browser][JSImport] Support for marshaling Memory<> #97381

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