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Comment by philipov | Hacker News Reader

> Here is a demo where you can hover the image to show/hide the overflow:

Is something supposed to happen when I hover my mouse over the image? Because nothing happens. I'm using Firefox.

You should, I think, at that point be seeing a square image of a jellyfish inside a red square. The square should be containing the image. When you hover, it should reveal the rest of the jellyfish (the image itself is rectangular, and wider than it is tall).

(I'm also using FF, and it works for me.)

yeah, I see the square jellyfish image inside the red square, but nothing changes when I hover.

It's a schooner!

it's not a schooner...it's a sailboat

I'm using Safari on Mac and it also does not work for me.

I'm using Firefox dev, it overflows for me. Are you sure you didn't hover the earlier screenshot of the unhovered image inside the red square, as opposed to the image inside a codepen embed?

Definitely using codepen. I can manipulate the scaling and view the html and css windows and stuff. I'm not using the latest firefox version, but it's not like this is a new feature right?

Works for me on FF stable 148.0, 153.0.4, but does not with FF 145.

Okay, I've figured it out, thanks to the "test distros online" thingy to test version 145 and 148 as I previously mentioned.[0]

From Firefox 148 release notes for developers:[1]

> The overflow, overflow-x, and overflow-y CSS properties can now be used on replaced elements such as images, in the same way that they are used with other elements. Prior to this, replaced elements were always clipped to their bounding container. (Firefox bug 1999100).

[0]: https://news.ycombinator.com/item?id=49272986 [1]: https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Rel...

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