I have a P element within a narrow DIV. When I view the HTML on my local machine the long words (words longer than the DIV’s width) get “broken” ie wrap onto a new line. When I check the developer console I note that there’s some grayed CSS associated with the P reads

overflow-wrap: break-word;

The funny thing is that the CSS is not in any file nor was it added by JavaScript.

Anyhow on the server the long words don’t wrap and there’s no associated CSS. I don’t understand why it appears in one place and not another and, if I want the words to break, should I code the CSS in?