[Bug Report] Extra spaces in the class
Open
- Dominant language
- Vue
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- 54k
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Description
### Element UI version
2.15.12
### OS/Browsers version
arc
### Vue version
2.7.14
### Reproduction Link
https://codepen.io/YAOWENLUTT/pen/wvxMVXo?editors=1111
### Steps to reproduce
There are extra spaces in the th class
### What is Expected?
```
可拖动列1
```
### What is actually happening?
```
可拖动列1
```
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