CSS tip: object-fit your images.
To have an image that doesn't try to stretch to its width/height the classic CSS is as follows:
.thumbnail {...
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I haven't really worked on enterprise apps/sites but I can tell you I have ignored ie9 for years for all my css work. And what's more, I am beginning to think that ignoring ie11 might be a good idea as well. Looking at caniuse, I don't think it's a good idea to waste time on making an app/site compatible with old, very low usage versions of browsers.
object fit degrades ok anyways, the image will be stretched, but I remember the days when background-image would result in a blank block in legacy browsers of the day (and you would have to polyfill that)
It's not responsive if you are fixing the height and width.
That's true, I guess it still works if one of the height or width isn't fixed (or is a percentage)
MSIE9 is ancient! only "modern" browser having problems with object-fit is MSIE11 afaik, and that's very low in usage anyway.