>>>>When I read Bootstrap 4 documentation, very often a class name has a prefix period (.). For example, .btn-group-toggle or .d-none and so on. What is the meaning of the period (.)? When I use classes in the HTML5 code, I don't think I enter them. For example, I could say
Why, then, in the docs they use this period?
>>>
>>>means you need to add this string in the class HTML attribute; eg. class="btn-group-toggle another-class"
>>
>>Thank you. This part I understood (that you have to add this string to the class attribute). It is just this (.) in the docs is/was confusing. I will just ignore it.
>
>usual visual convention in HTML doc, reminds a CSS class selector
Yes, makes sense.
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