In CSS layout: How does the display attribute of the child element affect the height of the parent element?

CSS layout: The effect of child element display attribute on parent element height

The height of the parent element is often affected by the combination of child element types and styles in CSS layouts. This article will use an example to analyze in depth how display attributes of child elements (especially inline-block and block ) affect the height of the parent element.

The following HTML code and CSS styles show a typical case:

<div class="outerbox1">
    This is the outer element 1
</div>

.outerbox1 {
    width: 600px;
    line-height: 300px;
    background-color: thistle;
}

.outerbox1 span {
    display: inline-block; /* Change this to block to observe the changes in the height of the parent element*/
    /* display: block; */
    background-color: teal;
}

outerbox1 is a parent element, containing a span child element. outerbox1 has line-height: 300px and width: 600px , and span element has line-height: 50px . display attribute of a span element is crucial, it determines how the element is rendered and ultimately affects the height of the parent element.

When display property of the span element is inline-block , it takes up a certain space but does not wrap the line. The height of the parent element outerbox1 is mainly determined by the content height of the span element and its own line-height: 300px . Since line-height of span is 50px and the content height does not exceed 50px, the height of the parent element is mainly determined by its own line-height .

However, after changing display property of the span element block , the situation changes. The block element occupies the entire line and the height is automatically adjusted according to the content. The height of the span element is no longer limited only by line-height , but depends on the content height. This causes the height of the parent element outerbox1 to change accordingly. It will adjust its height according to the actual height of the span element and will no longer be completely bound by its own line-height . The text itself can be regarded as an in-line element. line-height: 50px of the span element sets its content line height, but when display attribute becomes block , the line height is calculated differently from the overall height of the block element, thus affecting the height of the parent element.

The key to understanding this change is to master the rendering characteristics of inline-block and block elements and their interaction with the line-height attribute of the parent element. It is recommended to learn more about HTML and CSS related knowledge in depth to understand these layout mechanisms more thoroughly.

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