Hi, thanks for filling this issue.
First of all, Vue isn't responsible for auto prefixing styles, it's the job of css processors.
Edit: Vue does automatically add prefixes to property names, but not property values.
And it's actually Chrome that's ignoring the cursor: grab, you can verify this simply by trying

document.body.style.cursor = 'grab'

Browsers simply ignore css properties they can't recognize when setting style with javascript.

As for applying prefixed style objects (e.g. cursor: ['-webkit-grab','grab'], created by tools like postcss), it's currently not supported but there is an open PR for that. (#4994)

Thanks for the quick response (and for the PR)!

Vue isn't responsible for auto prefixing styles

Then I guess I'm misreading the docs (or it needs to be updated)?

When you use a CSS property that requires vendor prefixes in v-bind:style, for example transform, Vue will automatically detect and add appropriate prefixes to the applied styles.

Then I guess I'm misreading the docs (or it needs to be updated)?

Oops, sorry I was wrong about that. Vue does automatically add prefixes to property names, but not property values. Perhaps this should be noted in the docs..

No problem! That makes sense, thanks!

For now, how can I achieve this? I thought about returning something like postcss([autoprefixer]).process(styleObj).css in all computed properties, but I'm not sure if this is the recommended way.

For now, the only way is using <style> tags + prefixed css, instead of binding inline style with v-bind:style, since binding objects like cursor: ['-webkit-grab','grab'] requires v-bind:style to support array as value.

Closing as the PR has been merged. #5460