How can I modify the border color at the bottom of the .arrow_box:after?
document.getElementsByClassName("arrow_box:after")[0].style.borderBottomColor = "blue";
Despite trying this solution, it seems to be ineffective!
For a closer look at the issue, feel free to visit this example on Fiddle.
JavaScript cannot directly modify the styles of pseudo elements like :after or select them because they are not technically part of the DOM tree.
One workaround is to add another class to the element, as shown below:
document.getElementsByClassName("message_bubble")[0].className = "message_bubble highlighted";
.message_bubble.highlighted:after {
background-color: yellow;
}
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