add index.html template for viewport example

Sascha Schulz

2023-08-30 e3cc1968371467dfa5d61795bfe84eeaff0bc1e4

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const p = new Promise(function(resolve, reject) { 
    resolve("ok"); 
}); 
 
p.then(function(value) { 
    console.log(value); 
});