Why isn't the hr element from the 1st to the 3rd hour red as specified in the CSS code below?
hr:nth-of-type(n+1):nth-of-type(-n+3){
background:red;
}<!DOCTYPE html>
<html>
<head>
</head>
<body>
<hr />
<p>The first paragraph.</p>
<p>The second paragraph.</p>
<p>The third paragraph.</p>
<hr />
<hr />
<hr />
<p>The fourth paragraph.</p>
</body>
</html>If you're looking to add a border, consider using the border property:
border:1px solid red;
hr:nth-of-type(n+1):nth-of-type(-n+3){
border:1px solid red;
}<!DOCTYPE html>
<html>
<head>
</head>
<body>
<hr />
<p>The first paragraph.</p>
<p>The second paragraph.</p>
<p>The third paragraph.</p>
<hr />
<hr />
<hr />
<p>The fourth paragraph.</p>
</body>
</html>Make sure to define the border property, not background, and set the HR element as constants rather than formulas because they are supposed to be used for selecting items using other methods.
hr:nth-of-type(1), hr:nth-of-type(3){
border:1px red solid;
}<!DOCTYPE html>
<html>
<head>
</head>
<body>
<hr>
<p>The first paragraph.</p>
<p>The second paragraph.</p>
<p>The third paragraph.</p>
<hr>
<hr>
<hr>
<p>The fourth paragraph.</p>
</body>
</html>Source: https://developer.mozilla.org/en/docs/Web/CSS/:nth-of-type
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