问题
What is the difference between using these two when dealing with text that will never be more than a single line? They both can produce similar results on the screen from what I can see in regards to the elements on top or on the bottom of the element. Why use line-height at all if so? Height would make more sense to use.
Edit: An example of this a stylized button created from a div with text inside. This will never be multiline. So would line-height be needed for compatibility reasons? or anything I don't know about?
Thanks!
回答1:
height is the vertical measurement of the container.
line-height is the distance from the top of the first line of text to the top
of the second.
If used with only one line of text I'd expect them to produce similar results in most cases.
I use height when I want to explicitly set the container size and line-height for typographic layout, where it might be relevant if the user resizes the text.
回答2:
If you wrap the text in a div, give the div a height, and the text grows to be 2 lines (perhaps because it is being viewed on a small screen like a phone) then the text will overlap with the elements below it. On the other hand, if you give the div a line-height and the text grows to 2 lines, the div will expand (assuming you don't also give the div a height).
Here is a fiddle that demonstrates this.
回答3:
Assuming the text is smaller than the container:
Setting the line-height on the container specifies the minimum height of line-boxes inside it. For 1 line of text, this results in the text vertically centered inside the container.
If you set height on the container then the container will grow vertically, but the text inside it will start on the first (top) line inside it.
回答4:
For practical purposes in the case you cite (never wrapping to more than one line) line-height will vertically center the text. Be careful about that assumption though as the user ultimately controls the font-size.
回答5:
height = line-height + padding-top + padding-bottom
来源：https://stackoverflow.com/questions/7616618/height-vs-line-height-styling