change example for viewport, add examples for css units and css flexbox

Sascha Schulz

2023-09-12 3746a867f82bc09b1240b54370b3608677f779bc

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