Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<head>
<style>
p.one {
 border-style: solid;
 border-width: 5px;
}

p.two {
 border-style: solid;
 border-width: medium;
}

p.three {
 border-style: solid;
 border-width: 1px;
}
</style>
</head>
<body>

Some text.
Some text.
Some text.
Note: The "border-width" property does not work if it is used alone. Use the "border-style" property to set the borders first.

</body>
</html>

<!DOCTYPE html>
<html>
<head>
<style>
p.one {
    border-style: solid;
    border-width: 5px;
}

p.two {
    border-style: solid;
    border-width: medium;
}

p.three {
    border-style: solid;
    border-width: 1px;
}
</style>
</head>
<body>

<p class="one">Some text.</p>
<p class="two">Some text.</p>
<p class="three">Some text.</p>
<p><b>Note:</b> The "border-width" property does not work if it is used alone. Use the "border-style" property to set the borders first.</p>

</body>
</html>