add index.html template for viewport example

Sascha Schulz

2023-08-30 e3cc1968371467dfa5d61795bfe84eeaff0bc1e4

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const p = new Promise(function(resolve, reject) { 
    reject(new Error("Fehler")); 
}); 
 
p.catch(function(e) { 
    console.log(e.message); 
});