function makeSizer(size) {
return function() {
document.body.style.fontSize = size + 'px';
};
}
document.getElementById('size-12').onclick = makeSizer(12);
document.getElementById('size-14').onclick = makeSizer(14);
document.getElementById('size-16').onclick = makeSizer(16);
Preview:
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Tip: You can change the style, width & colours of the snippet with the inspect tool before clicking Download!
Click to optimize width for Twitter