Steps to Reproduce
Expected
The Divider should render between Grid.Columns
Result
The Divider instead render on the left side
Testcase
http://react.semantic-ui.com/elements/divider#divider-example-vertical
There is a W3C spec change issue causing this bug in the CSS:
Note, you can work around this by putting dividers inside of a column rather than in between them:

import React from 'react'
import { Grid, Segment, Divider } from 'semantic-ui-react'
const DividerExampleVertical = () => (
<Grid columns='equal' padded>
<Grid.Column>
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Donec odio.
</Grid.Column>
<Grid.Column width='1'>
<Divider vertical>Or</Divider>
</Grid.Column>
<Grid.Column>
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Donec odio.
</Grid.Column>
<Grid.Column width='1'>
<Divider vertical>Or</Divider>
</Grid.Column>
<Grid.Column>
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Donec odio.
</Grid.Column>
</Grid>
)
export default DividerExampleVertical
thanks @levithomason, sorry i forgot to check the open issues.
No worries.
Most helpful comment
Note, you can work around this by putting dividers inside of a column rather than in between them: