Unnecessary whitespace comes from many sources: It’s added from developers to have a readable code (required!), it’s added from frameworks (oh well), it’s added from auto-formatting and saving rules of your ide (and 4 tabs may end as 32 spaces), and maybe it’s added from other tools in your development chain. In the development cycle whitespace is important, but when the page is delivered it’s unnecessary. So let’s get rid of it with mod_substitute.
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