VisualViewport.offsetTop
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2021年8月.
VisualViewport 接口的只读属性 offsetTop 返回视觉视口的顶部相对于布局视口的顶部的偏移量，以 CSS 像素为单位。
语法
var offsetTop = VisualViewport.offsetTop
值
一个双精度值。
规范
| Specification |
|---|
| CSSOM View Module # dom-visualviewport-offsettop |
浏览器兼容性
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