CSS env()函数

原文:https://www.geeksforgeeks.org/css-env-function/

env() 函数用于将用户代理定义的环境变量的值插入到你的 CSS 中。它与 CSS 中的 var()几乎相同，只是这些值是用户代理定义的，而不是用户定义的。这些变量是全局范围的。

语法:

env( <custom-ident> , <declaration-value> )

注意:请注意，env()属性值区分大小写。

属性值:

  • SAFE-AREA-INSET-TOP: It defines the top of the rectangle from the edge of the viewport.

    语法:

    ```html env(SAFE-AREA-INSET-TOP,Integer_value)

    ```

    示例:

    超文本标记语言

    ```html <!DOCTYPE html>

             

            p {             background-color: green;             width: fit-content;             color: white;             font-size: 20px;             border: env(SAFE-AREA-INSET-TOP,                          5px) solid black;             padding: 10px;             padding: env(SAFE-AREA-INSET-TOP, 50px)                  env(safe-area-inset-right, 50px)                  env(safe-area-inset-bottom, 50px)                  env(safe-area-inset-left, 50px)         }     

        

    50px padding from top

    Geeks for geeks

    ```

    输出:

  • SAFE-AREA-INSET-RIGHT: It defines the right of the rectangle from the edge of the viewport.

    语法:

    html env(SAFE-AREA-INSET-RIGHT,Integer_value);

    示例:

    超文本标记语言

    ```html <!DOCTYPE html>

             

            p {             background-color: green;             width: fit-content;             color: white;             font-size: 20px;             border:                 env(SAFE-AREA-INSET-TOP, 5px) solid black;             padding: 10px;             padding: env(safe-area-inset-top, 50px)                      env(SAFE-AREA-INSET-RIGHT, 50px)                      env(safe-area-inset-bottom, 50px)                      env(safe-area-inset-left, 50px)         }     

        

    50px padding from right

    Geeks for geeks

    ```

    输出:

  • SAFE-AREA-INSET-LEFT: It defines the left of the rectangle from the edge of the viewport.

    语法:

    ```html env(SAFE-AREA-INSET-LEFT,Integer_value);

    ```

    示例:

    超文本标记语言

    ```html <!DOCTYPE html>

             

            p {             background-color: green;             width: fit-content;             color: white;             font-size: 20px;             border:                 env(SAFE-AREA-INSET-TOP, 5px) solid black;             padding: 10px;             padding: env(safe-area-inset-top, 50px)                      env(safe-area-inset-bottom, 50px)                      env(safe-area-inset-right, 50px)                      env(SAFE-AREA-INSET-LEFT, 50px)         }     

        

    50px padding from left

    Geeks for geeks

    ```

    输出:

  • SAFE-AREA-INSET-BOTTOM: It defines the bottom of the rectangle from the edge of the viewport.

    语法:

    html env(SAFE-AREA-INSET-BOTTOM,Integer_value);

    示例:

    超文本标记语言

    ```html <!DOCTYPE html>

             

            p {             background-color: green;             width: fit-content;             color: white;             font-size: 20px;             border:                 env(SAFE-AREA-INSET-TOP, 5px) solid black;             padding: 10px;             padding: env(safe-area-inset-top, 50px)                  env(safe-area-inset-left, 50px)                  env(SAFE-AREA-INSET-BOTTOM, 50px)                  env(safe-area-inset-right, 50px)         }     

        

    50px padding from bottom

    Geeks for geeks

    ```

    输出:

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