update en/application-dev/reference/arkui-js/js-components-basic-toolbar-item.md.

Signed-off-by: NLiAn <lian15@huawei.com>
Signed-off-by: NLiAn <lian15@huawei.com>

en/application-dev/reference/arkui-js/js-components-basic-toolbar-item.md

@@ -40,7 +40,7 @@ Only the following styles are supported.
 | background-image    | string                                   | -            | No   | Background image. Currently, this attribute is not compatible with **background-color** or **background**. Both online and local image resources are supported.|
 | background-size     | - string<br>- &lt;length&gt; &lt;length&gt;<br>- &lt;percentage&gt; &lt;percentage&gt; | auto         | No   | Background image size.<br>- The **string** values are as follows:<br>  - **contain**: Expands the image to the maximum size so that its height and width are fully applicable to the content area.<br>  - **cover**: Extends the background image to a large enough size so that it completely covers the background area. Some parts of the image may not be displayed in the background area.<br>  - **auto**: Retains the original aspect ratio of the image.<br>- The two **length** values are width and height of the background image. The first value indicates the width, and the second value indicates the height. If you only set one value, the other value is set to **auto** by default.<br>- The two **\<percentage>** values are width and height of the background image in percentage of the parent element. The first value indicates the width, and the second value indicates the height. If you only set one value, the other value is set to **auto** by default. |
 | background-repeat   | string                                   | repeat       | No   | How a background image is repeatedly drawn. By default, a background image is repeated both horizontally and vertically.<br>- **repeat**: The image is repeated along the x-axis and y-axis at the same time.<br>- **repeat-x**: The image is repeated along the x-axis.<br>- **repeat-y**: The image is repeated along the y-axis.<br>- **no-repeat**: The image is not repeated.|
-| background-position | - string string<br>- &lt;length&gt; &lt;length&gt;<br>- &lt;percentage&gt; &lt;percentage&gt; | 0px 0px | No   | Position of the background image.<br>- Using keywords: If only one keyword is specified, the other value is **center** by default. The two values define the horizontal position and vertical position, respectively.<br>  - **left**: leftmost in the horizontal direction.<br>  - **right**: rightmost in the horizontal direction.<br>  - **top**: top in the vertical direction.<br>  - **bottom**: bottom in the vertical direction.<br>  - **center**: center position.<br>- Using **<length>**: The first value indicates the horizontal position, and the second value indicates the vertical position. For the upper left corner, the value is **0 0**. The unit is pixel. If only one value is specified, the other one is **50%**.<br>- Using **\<percentage>**: The first value indicates the horizontal position, and the second value indicates the vertical position. **0% 0%** indicates the upper left corner. **100% 100%** indicates the lower right corner. If only one value is specified, the other one is **50%**.<br>- Using both **\<percentage>** and **\<length>**.|
+| background-position | - string string<br>- &lt;length&gt; &lt;length&gt;<br>- &lt;percentage&gt; &lt;percentage&gt; | 0px 0px | No   | Position of the background image.<br>- Using keywords: If only one keyword is specified, the other value is **center** by default. The two values define the horizontal position and vertical position, respectively.<br>  - **left**: leftmost in the horizontal direction.<br>  - **right**: rightmost in the horizontal direction.<br>  - **top**: top in the vertical direction.<br>  - **bottom**: bottom in the vertical direction.<br>  - **center**: center position.<br>- Using **\<length>**: The first value indicates the horizontal position, and the second value indicates the vertical position. For the upper left corner, the value is **0 0**. The unit is pixel. If only one value is specified, the other one is **50%**.<br>- Using **\<percentage>**: The first value indicates the horizontal position, and the second value indicates the vertical position. **0% 0%** indicates the upper left corner. **100% 100%** indicates the lower right corner. If only one value is specified, the other one is **50%**.<br>- Using both **\<percentage>** and **\<length>**.|
 | opacity             | number                                   | 1            | No   | Opacity of an element. The value ranges from **0** to **1**. The value **1** means opaque, and **0** means completely transparent.       |
 | display             | string                                   | flex         | No   | Type of the box containing an element. Available values are as follows:<br>- **flex**: Flexible layout.<br>- **none**: The box is disabled.|
 | visibility          | string                                   | visible      | No   | Whether to display the box containing an element. A hidden box still occupies layout space. (To remove the box, set the **display** attribute to **none**.) Available values are as follows:<br>- **visible**: The element is visible.<br>- **hidden**: The box is hidden but still takes up space.<br>If both **visibility** and **display** are set, only **display** takes effect.|