WHY-NOT.md

Why Not?

Why no extra prefix for Layout blocks? Maybe l- or lb-?

Visually it's not that easy to figure the difference between a lowercase l and a 1. But this is not the main reason.

Since those layout blocks are already prefixed with b-page- there is no reason to prefix them with an additional prefix.

Why don't you remove the prefix from page, main, nav, header, aside, footer classes?

Because if we would use .header as class for the header, it would influence other .header elements of other blocks. For instance:

CSS

.page
.header
.main
	.b-article
		.header
		.content
.footer

If we set color for .header now, we would have to reset it on .b-article .header.

Don't even think about abusing .header[role=banner] as excuse! Count: 1 (increment if you tried!). ;)

Why extends instead of placeholders for the placeholders/extends folder?

Because mixins contains all @mixin definitions in single files. Usage: @include mixin-name(param1, param2)

Because extends contains all %placeholder definitions in single files. Usage: @extend %placeholder-name