createIntersectionObserver编译到web，放到iframe里面和直接打开，两种场景observe触发时机表现不一致
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h5
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Description
createIntersectionObserver编译到web，放到iframe里面和直接打开，两种场景observe触发时机表现不一致。
在iframe中明显向上偏移了视口区域。
复现demo链接：[uni-h5-intersection-observer-iframe](https://gitee.com/wot-design-uni/uni-h5-intersection-observer-iframe)。
操作步骤参考以下视频：
https://github.com/dcloudio/uni-app/assets/26426873/e6dc416c-ae4c-46fc-8e78-87dcc23915d9
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