Is there a way to dynamically add a new CSS property to an existing class using JavaScript?
Let's say I have a class called .test with some pre-defined styling. How can I append the property color: blue; to this class using JavaScript?
const elm = document.querySelector('.test');.test {
width: 200px;
height: 50px;
background-color: orange;
}<div class="test">Testing...123</div>If you're looking to locate a specific CSS rule with the selector of .test and then apply additional properties to it, follow these steps:
let target;
outer: for(let sheet of document.styleSheets) {
for(let rule of sheet.rules) {
if(rule.selectorText === '.test') {
target = rule;
break outer;
}
}
}
if(target) {
target.style.backgroundColor = 'green';
}.test {
font-size: 16px;
line-height: 1.5;
color: #333;
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