What effect does the overflow have?

[kaphula]

I don't understand what is the concrete effect of specifying overflow in Style. Can someone explain this to me? My thought was that setting overflow to Scroll would automatically adjust the node's scrollbar to specified scrollbar_size from 0 when the node's children content size surpasses the node's size, but that does not seem to be the case. If I set scrollbar_size style to a node, it is always active, eating a portion from the node's space. So what is the point of having overflow style setting then?

[nicoburns]

We will hopefully implement overflow: auto (which behaves as you expected scroll to in the future).

The biggest thing at the moment is that overflow: hidden and overflow: scroll disable the "automatic minimum size" for Flexbox and CSS Grid items. Also, overflow: scroll enables the scrollbar_size style. That's a little redundant (you could just set it to 0), but means that our API is 1:1 with the web API (Taffy's overflow property behaves like the web overflow property). Finally, it affects the computed content_size (if overflow is visible then overflowing children are included in that nodes size for scroll width/height calculation).