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並前往https://supportcenter.devexpress.com/ticket/details/q496036/unable-to-get-property-offsetwidth-of-undefined-or-null-reference-on-ie10-windows-8

"Unable to get property 'offsetWidth' of undefined or null ...

offsetWidth ; var height = element.offsetHeight; var container; if(element.className == ASPxAnimationHelper.SLIDE_CONTAINER_CLASS)

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查詢 「offsetWidth」的人也找了：

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