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style font size javascript

document.getElementById("your element").style.fontSize = "20%"
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get element font size javascript

// get reference to element using its ID or querySelector
const myElement = document.getElementById("elementID");

// pass element reference and getPropertyValue of font-size
const size = window.getComputedStyle(myElement).getPropertyValue("font-size");
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javascript style font size

document.getElementById("foo").style.fontSize = "18"
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how to get font size in javascirpt

const fontSize = window.getComputedStyle(document.getElementById("yourFontSizeinCSS")).fontSize;
const size = parseFloat(fontSize);
document.getElementById("one").style.fontSize = `${size * 3}px`;
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how to get font size in javascript

const element = document.querySelector("#id");
const size = window.getComputedStyle(element).getPropertyValue("font-size");
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