How Does Line Height Interact with Text Characters and Browser Rendering?

Does Line Height Depend on Text Character?

<p>blah_blah</p><p></p><p></p><p>qypj;,</p>

When setting line-height to 1 in CSS, the behavior may vary across browsers. This example, rendered in Firefox, shows that underscores in the first line do not appear, while in the third line, they do. Other browsers and the snippet runner display underscores in both cases.

Which Behavior is Correct?

Different browsers and fonts can influence line height calculations. It is not solely dependent on the line-height property.

Can Characters Alter Line Height?

No, characters alone cannot change line height. However, certain characters, like "p", "g", and "j", may extend below the baseline and contribute to the vertical space needed for the line.

Implication of line-height: 1

Setting line-height to 1 does not guarantee that any text will fit within the designated space. It only specifies that the line box should be exactly the size of the font.

Content Area vs. Line Box

The font properties define the content area, while line-height controls the line box. We cannot control the content area but can adjust the line box to accommodate text.

Example:

span {<br>  background: red;<br>  color: #fff;<br>  font-size: 20px;<br>  font-family: monospace;<br>}<p>body {<br>  margin: 10px 0;<br>  border-top: 1px solid;<br>  border-bottom: 1px solid;<br>  animation: change 2s linear infinite alternate;<br>}</p><p>@keyframes change {<br>  from {</p><pre class="brush:php;toolbar:false">line-height: 0.2

}

to {

line-height: 2

}
}

blah_blah<br>

In this example, the span's content area remains constant, but the line box expands and contracts as the line-height changes. This demonstrates the independent control of content area and line box.

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