The insertRule() function seems to be failing to add the rule as expected, yet no

I've encountered an issue where I'm attempting to directly insert a style rule into the head of a document.

Although it successfully inserts the style element, the code itself does not get inserted. Strangely, there are no errors being thrown.

var thumbStyles = document.createElement("style"); 
    document.head.appendChild(thumbStyles);
    thumbStyles.sheet.insertRule(
    "figure#styleThumbs { \
    position: absolute; \
    left: 0px; \
    bottom: 0px; \
    } \
    ")
    thumbStyles.sheet.insertRule(
    "figure#styleThumbs img { \
    outline: 1px solid black; \
    cursor: pointer; \
    opacity: 0.75; \
    } \
    ")
    thumbStyles.sheet.insertRule(
    "figure#styleThumbs img:hover { \
    outline: 1px solid red; \
    opacity: 1.0; \
    } \
    ");

Check out this image of HTML Head showing style but no style code

I attempted to ask about this on FCC but have yet to receive any answers

javascripthtmlcssnodes

Answer №1

Although the CSS inserted is not visible in the DOM, it does function properly.

var customStyle = document.createElement("style"); 
document.head.appendChild(customStyle);
customStyle.sheet.insertRule(`#example{
color: red;
}`);
<div id="example">
This is an example
</div>

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