One em is the width and height of one “m” character (using whatever font size a website is set to).

1em正好是一个“m”字符的宽度和高度(而无论你的网站使用多大的字号)。

youdao

It shows character and that's important where I'm from."

VOA: standard.2010.04.09

I'm sort of love this movie, I'm start expecting certain type of character sort of boring character.

但我还是有些喜欢这部电影，至少开始喜欢个别角色,尽管他看起来可能有些没劲。

麻省理工公开课 - 电影哲学课程节选

Because what you don't see in this file is any code a that actually says put a letter of the alphabet at the top left hand corner of the screen and then put the next character to the right in other words, I'm taking for granted at this moment in time that my computer knows how to print something to the screen.

就是这些你在本文件中看不到的一些代码,实现了将首字母,放在屏幕的左上角,然后把其他字母加在其右边，我想当然地认为,我的电脑知道如何打印相应信息到屏幕上。

哈佛公开课 - 计算机科学课程节选

"I'm a flawed character, " he said.

NPR: Armstrong Admits Doping: 'I'm A Flawed Character'

I'm reminded of the fundamental character of the Americans that I'm so privileged to serve.

WHITEHOUSE: "White House to Main Street" Town Hall: Elyria, OH

Judi Dench is probably incapable of being bad, but M is a real character this time, with emotions, as well as convictions, and she hits every note just so.

CNN: Review: 'Skyfall' is Bond resurrected and reinvigorated