max-content
https://developer.mozilla.org/en-US/docs/Web/CSS/max-content
The max-content sizing keyword represents the maximum intrinsic size of the content. For text content this means that the content will not wrap at all even if it causes overflows.
min-content
https://developer.mozilla.org/en-US/docs/Web/CSS/min-content
The min-content sizing keyword represents the minimum intrinsic size of the content. For text content this means that the content will take all soft-wrapping opportunities, becoming as small as the longest word.
fit-content
https://developer.mozilla.org/en-US/docs/Web/CSS/fit-content
The fit-content keyword is equivalent to fit-content(stretch). In practice, this means that the box will use the available space, but never more than max-content.
width: fit-content;
// the same as
min-width: min-content;
width: auto;
max-width: max-content;
fint-content(strach)
https://developer.mozilla.org/en-US/docs/Web/CSS/fit-content_function
The fit-content() CSS function clamps a given size to an available size according to the formula min(maximum size, max(minimum size, argument)).
minmax()
https://developer.mozilla.org/en-US/docs/Web/CSS/minmax
The minmax() CSS function defines a size range greater than or equal to min and less than or equal to max. It is used with CSS grids.
clamp()
https://developer.mozilla.org/en-US/docs/Web/CSS/clamp
The clamp() CSS function clamps a middle value within a range of values between a defined minimum bound and a maximum bound. The function takes three parameters: a minimum value, a preferred value, and a maximum allowed value.
font-size: clamp(1rem, 2.5vw, 2rem);
标签：fit,min,max,content,CSS,size From： https://www.cnblogs.com/Answer1215/p/18338844