Websfg sfg.c as wasm sugiyama graph layout running in the browser

This is a test-version and See sfg.c in sfgraph at notabug

Enter your graph data as edges between node numbers into the text area below.
The node numbers must start with number 1 and try the sample buttons below.
Enter a edge from node number 2 to node number 3 like this way on one line:
2 3

maximum 1000 chars input text