CSS neutral min-height and max-height properties

Why do we use min-height and max-height style attributes?

Css min-height application place explanation

We sometimes set an object box to prevent the object from being able to open when it has no content, but the content cannot be determined, so the height cannot be fixed. At this time, we You will need css to set min-height to raise the object box. When the content is small, the minimum height can display the content. If the content is more than the minimum height, the object will increase as the content increases.

Css max-height maximum height application explanation

This attribute is rarely used, probably to avoid too much content that will cause the height to be too high and affect the beautification and uniformity of the layout. At this time, we set the maximum height limit . For example, a table tr td table object contains a picture, and the height of the picture is uncertain. If it is too high and you don't want the picture to break the tr td table, it is necessary to limit the maximum height of the picture through CSS max-height.

1. Grammar and structure - TOP

1. Grammar

The values ​​of min-height and max-height are numbers + html units

Exp

min-height:50px minimum height 50px

max-height:50px maximum height 50px

2. CSS usage structure

div{min-height: 50px }

div{max-height:50px }

2. Maximum and minimum height usage examples - TOP

We set two object boxes with a minimum height (min-height :) With the maximum height (max-height) limit, in order to facilitate the observation of the application case effect, we set the CSS width and css border style of the two boxes to be the same.

1. Corresponding css code

.divcss5-min,.divcss5-max{ width:300px; border:1px solid #F00} 
.divcss5-min{ min-height:60px} 
.divcss5-max{ max-height:60px; margin-top:10px}

2. Case html source code fragment:

<div class="divcss5-min"> 
    最小高度为60px 
</div> 
<div class="divcss5-max"> 
    最大高度为60px 
</div>

3. Maximum and minimum height case screenshots

Css div minimum maximum height style case screenshot

4. We will increase the content of the two objects

Html code:

<div class="divcss5-min"> 
    最小高度为60px<br /> 
    DIVCSS5增加内容<br /> 
    增加内容<br /> 
    divcss5增加内容 
</div> 
<div class="divcss5-max"> 
    最大高度为60px<br /> 
    www.divcss5.com<br /> 
    增加内容<br /> 
    divcss5增加内容<br /> 
    增加内容 
</div>

Here we will both add 2 The content in the object box increases beyond the 60px height limit

5. Experimental screenshots

##Min-height max-height case screenshots in the browser

Browser test min-height and css max-height screenshots

Tips, if you add the overflow:hidden style to the css name ".divcss5-max", you can hide the maximum height and display the overflow content.

CSS solves the max-height style bug case screenshot

DIV+CSS case solves the maximum height max-height compatibility

6. DIVCSS5 case explanation

We set up two boxes, one with a minimum height limit, and one with a maximum height limit. If the object with the minimum height limit does not have much content, it will not exceed the minimum height limit. At this time, the object will display the minimum height limit value. , if the content exceeds the minimum height limit and can be placed, the object will automatically increase in height. The latter has a maximum height limit of max-height. When the content is small, there will be no difference. However, when there is a lot of content and the maximum height limit cannot be accommodated, the content will exceed the maximum height limit, but the object itself is still the maximum height, so the content will appear. If the overflow exceeds the object box, we can use the css overflow property to hide the overflow content.

3. Summary of max-height min-height maximum and minimum height - TOP

The maximum and minimum height style is very convenient to use and meets the disadvantages of fixed height. However, it is not supported by IE6 now and can be browsed by IE7 and above. Both browsers and other browsers support it. In the next article, we will introduce ie6 min-height compatibility and ie6 max-height compatibility.

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