What is the method for using the "less than" operator in a CSS3 selector?

Suppose I have the following tag:

<div id='testdiv' style='height:300px;'></div>

What is the best way to create a CSS rule that targets the element:

Select the tag with the id testdiv only if it has a style attribute setting its height property to less than 400px

Can this be achieved using CSS?

Answer №1

At this moment, the current CSS standard does not have a built-in selector for this specific task. There is speculation that CSS4 might introduce one in the future, but that remains uncertain for now. For the time being, achieving this behavior is possible through JavaScript or jQuery.

It's important to acknowledge that IDs must be unique within a document. If you need to use the same identifier multiple times, utilizing classes is recommended.

In jQuery, the filter method can be employed to address this issue effectively.

var smallDivs = $(".test-div").filter(function() {
    return $(this).css("height") < 400;
});

Alternatively, this functionality may also be achievable in SASS by creating custom functions.

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