box-sizing: the default content-box and border-box.max-content value makes the element as wide as its widest child, whereas min-content makes the element as wide as its narrowest child.fit-content value, compared to max-content and min-content.fill value for width makes the inline-block caption shown here fill the available width of its parent.| Chrome | Firefox | Safari | IE | |
|---|---|---|---|---|
| Root-relative units | Yes | Yes | Yes | Yes |
| Viewport-relative units | Yes | Yes | Yes* | IE9†, IE10‡ |
| Calculated values | Yes | Yes | Yes | Yes |
| Box sizing | Yes | Yes | Yes | Yes |
| Intrinsic/extrinsic sizing | Yes§ | Yes§ | Yes§ | No |
vh in iOS.vm instead of vmin, no support for vmax.vmax.Where a Yes is used in these support tables it means that the feature is supported either in an evergreen browser or in at least the last three versions of Safari (6–8) or IE (9–11). Otherwise, a version number will be shown. With regards to IE, it’s safe to presume that, with a very few exceptions, almost nothing in this book is implemented in IE8 or below.
For more complete version history I highly recommend the Can I use… compatibility tables.