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i don't get why some of the attributes starts with : and some do not, like <sidebar :show.sync="showRight" placement="right" header="Title" :width="350">. these are the type of things that makes me cringe =/

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that's vuejs shorthand for binding the attribute to a variable (or a js value).

i.e. show is bound to the value of showRight placement is read as "right" width is set to be the int 350.

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