doc: update css.md.

docs/css.md

@@ -1396,6 +1396,27 @@ body {
 }
 ```
 
+### 吸附滚动
+<!--rehype:wrap-class=row-span-2-->
+
+```css {5,12}
+.container {
+  height: 250px;
+  overflow-x: scroll;
+  display: flex;
+  scroll-snap-type: x mandatory;
+  column-gap: 10px;
+}
+.child {
+  flex: 0 0 66%;
+  width: 250px;
+  background-color: #663399;
+  scroll-snap-align: center;
+}
+```
+
+可用于 `轮播图` 效果，[效果预览](https://codesandbox.io/embed/pensive-leftpad-w9p8rk?fontsize=14&hidenavigation=1&theme=dark)
+
 ### 类似 contenteditable 的样式
 
 ```css

docs/golang.md

@@ -89,7 +89,7 @@ Golang 基本类型
 s1 := "Hello" + "World"
 s2 := `A "raw" string literal
 can include line breaks.`
-// 输出：11
+// 输出：10
 fmt.Println(len(s1))
 // 输出：Hello
 fmt.Println(string(s1[0:5]))