​x
 
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<!DOCTYPE html>
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<title>My Example</title>
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<style>
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    .a {
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        font-size: 14px;
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    }
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    .b {
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        font-size: 1.2em;
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    }
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    .c {
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        font-size: 120%;
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    }
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    .d {
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        font-size: 4vh;
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    }
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    .e {
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        font-size: 4vw;
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    }
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</style>
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​
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<p class="a">Some random text to demonstrate the effect.</p>
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<p class="b">Some random text to demonstrate the effect.</p>
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<p class="c">Some random text to demonstrate the effect.</p>
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<p class="d">Some random text to demonstrate the effect.</p>
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<p class="e">Some random text to demonstrate the effect.</p>
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<p class="f">Some random text to demonstrate the effect.</p>