Differences in line spacing can be observed between the INPUT and LABEL elements

Question

Differences in line spacing can be observed between the INPUT and LABEL elements

What could be causing this unusual behavior when setting line-height to match font-size:

While the height of label is 16px, the height of input is 18px... Why is that?

If I adjust line-height: 18px or higher, the heights suddenly align. But why does this happen?

<style>
label, input {

    font-size: 16px;
    line-height: 16px;
    padding: 0;
    margin: 0;
    float: left;
    border: none;            
    font-family: Arial, Helvetica, sans-serif;
}
label {
    position: absolute;
}
</style>
<form>
    <label for="email">Enter your email</label>
    <input type="email" name="email" />      
</form>

Chrome version 36 screenshots clearly display the 16/18px height contrast and absence of border, margin, or padding:

html css

Answer 1

Answer №1

According to the information provided on MDN's website:

For replaced inline elements such as buttons or input fields, the line-height property does not have any impact.

If you eliminate the line-height property, both elements will be rendered with a height of 18px. However, setting the line-height equal to the font-size (commonly done using a unit-less value like 1, which represents 1x the font size) can have interesting effects. For instance, by specifying a line-height of 16px, you are actually restricting the total height based on the default 18px to only 16px. This concept becomes even more apparent when setting the line-height to .5, demonstrated in this example:

input, label {
    line-height: .5;
    background: #eee;
}
input {
    background: #aaa;
}

Answer 2

According to the information provided on MDN's website:

For replaced inline elements such as buttons or input fields, the line-height property does not have any impact.

If you eliminate the line-height property, both elements will be rendered with a height of 18px. However, setting the line-height equal to the font-size (commonly done using a unit-less value like 1, which represents 1x the font size) can have interesting effects. For instance, by specifying a line-height of 16px, you are actually restricting the total height based on the default 18px to only 16px. This concept becomes even more apparent when setting the line-height to .5, demonstrated in this example:

input, label {
    line-height: .5;
    background: #eee;
}
input {
    background: #aaa;
}

Answer 3

Answer №2

Have you ever wondered what exactly line-height signifies in CSS? It plays a crucial role in determining the spacing between lines within a paragraph, rather than affecting the physical height of the HTML element itself.

Just so you know, the variation in height is primarily due to the 1px border that is included in the input field but not in the label.

Answer 4

Have you ever wondered what exactly line-height signifies in CSS? It plays a crucial role in determining the spacing between lines within a paragraph, rather than affecting the physical height of the HTML element itself.

Just so you know, the variation in height is primarily due to the 1px border that is included in the input field but not in the label.

Differences in line spacing can be observed between the INPUT and LABEL elements

Answer №1

Answer №2

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