change font size based on original size

MentalChaos

New Member
How can I do functionality that for example i have input in which I type in value from 1 to 10 and if value is set to 1 all font-size is original and if 10 then font-size for each element changes to 10 * original size ?please notice that there can me thousands of elements (words) on the site. performance is crucial
 
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