If you have low vision, you might want to add the size button for quick access to the relative font size.
如果视力不好，可以添加“大小”按钮以便快速选择相对的字体大小。
The more popular method is to set your font-size for the whole document, then, base everything on a relative size from there.
一个更通用的方法是在为整个文章设置字体大小，然后从那儿将每个部分字体以一个相关的大小为基础。
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