Can you explain the significance of "[dir]" when it comes to HTML and CSS?


I am in need of an explanation regarding the significance of "[dir]" in the following css code:

[dir] .layoutContainer {
  background: #fff;
  box-shadow: 0 1px 0 rgba(57,76,96,.15);
  padding: 8px;
}

Your help is greatly appreciated!

Answer №1

It's just an attribute. Take a look at this code snippet:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Test</title>
    <style type="text/css">
        [dir]{
            background-color: red;
        }

        [dir] .layoutContainer {
            background-color: yellow;
        }
    </style>
</head>
<body>

    <div dir='aa'>A<span class='layoutContainer'>B</span>C</div>
    <div dir='aa'>A</div>
    <div dir='aa'>A</div>

    <br>

    <b dir='bb'>Bo<span class='layoutContainer'>l</span>d</b>

    <br>

    <h1 dir>He<span class='layoutContainer'>ad</span>ing</h1>

    <h2>He<span class='layoutContainer'>ad</span>ing 2</h2>
</body>
</html>

When using CSS, the [dir] selector targets all elements with a dir attribute, regardless of whether it has a value or is standalone.

Similarly, in your code, [dir] .layoutContainer selects all elements with the class layoutContainer that are children of elements containing the dir attribute.

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