Typo # switch .
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querySelector (and querySelectorAll) is a new method that takes a CSS style selector as it's argument. Remember that we can ask for classes in CSS using the #, ids using the ., and elements by using the element name (eg: 'body'). These selectors will use the same format. It is best to only use ids with querySelector because it will only return the first item matching that selector.
Aren't classes referenced with the . and ids with the #?
It is reading correctly for me, would you beable to make the amendment or point out the line and file this occurs? You are correct that . indicates a class and # is an ID if there was any confusion.
I can confirm the offending text is not there at this moment and reads correctly if you'd be so kind as to close this.