HTMLDivElement not reactive in computed property

[ljcremer]

Version

3.0.0

Reproduction link

https://jsfiddle.net/ljcremer/uLjd85va/159/

Steps to reproduce

Run the application and then change the width of the fiddle run section.

What is expected?

I expect the computed property computedWidth to change reactively

What is actually happening?

It does not change reactively

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I first tried with ref but the same symptom.
Also tried to use the recommended method in #901 but still no luck

[jacekkarczmarczyk]

dom properties are not reactive

[yyx990803]

This is expected behavior. Vue does not observe native DOM elements. Only plain userland objects can be made reactive.