Q) Which is preferable for SEO - half-width spaces or  ?

When HTML is minified, trailing half-width spaces sometimes get removed, causing text or layout to become cramped. I sometimes use   for half-width spaces, but I’m wondering if words containing these are still properly recognized for SEO.

A) There’s hardly any difference. If pursuing perfection, half-width spaces are preferable. The reason is that you can make HTML file sizes smaller.

That’s all from the Gemba.