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) { 
    resolve("ok"); 
}); 
 
p.then(function(value) { 
    console.log(value); 
});