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Marcy promotes the method of adding stable CSS class names in order to lower the barrier for users who want to create custom stylesheets.

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Transcript from the "CSS in JS" Lesson

>> Marcy Sutton: For working in JavaScript applications. A lot of times now, CSS is being written with JavaScript and in JavaScript. So it might be a good idea to add a stable CSS class. And I have an example of this, in the slides. So let's zoom out a little bit.

[00:00:20] So in this presentation. I have some CSS in JS and you can observe that these CSS class names are randomly generated. And for a user to try and restyle that, like i hear about this on Twitter. People wanting to change the way that the Twitter interface works. If you add some stable class names, you can give users a bit more of a handle to write user style sheets.