![]() (Commonly used for positioning or visibility.) These utility classes have a single function, often using !important to boost their specificity. These modules have no cosmetics and are purely used to position c- components and structure an application’s layout. This is the system I have adopted, and many of the prefixes will appear throughout the code samples in this article: Typeįorm the backbone of an application and contain all of the cosmetics for a standalone component. This idea stems from Harry Robert’s namespacing technique, which improves code readability. This stands for “component” and forms the basis of how I namespace my BEM classes. ![]() “Should I Be Namespacing?”īy now, you’ve probably noticed the use of c- littered throughout my code samples. So, we would be able to move the text and images into c-card_header or even introduce a new c-card_footer element without breaking the semantic structure. This means that all of the descendent elements will be affected only by the card block. This is how I would treat the same card component: The naming convention is there to help you identify relationships with the top-level component block - in this case, c-card. If you’re getting to great-great-great-grandchild levels, then you’ll probably want to revisit your component structure anyway.īEM naming isn’t strictly tied to the DOM, so it doesn’t matter how many levels deep a descendent element is nested. BEM stands for Block_Element–Modifier, not Block_Element_Element–Modifier. I believe the double-underscore pattern should appear only once in a selector name. I’ve used a short block name of c-card and the short element names of body, text and link, but you can imagine how out of control it gets when the initial block element is named something like c-drop-down-menu. I’ll give you an example:Īs you might imagine, naming in this way can quickly get out of hand, and the more nested a component is, the more hideous and unreadable the class names become. These bad boys are the bane of my life, and I’m sure their misuse is one of the reasons people have an immediate aversion to BEM. To clarify, you would use a grandchild selector when you need to reference an element that is nested two levels deep. “What To Do About ‘Grandchild’ Selectors (And Beyond)?” Here are the 10 dilemmas I’ve battled with and some tips on how to deal with them. I certainly don’t recommend picking a living-room centrepiece this way, but when you need a life jacket (as you do in a sea of CSS), I’ll take function over form any day. And, eventually, the logical, modular way of building a user interface outweighed the right-side of my brain that complained, “But it’s not pretty enough!”. The developer in me looked at it pragmatically. The designer in me didn’t want my sexy markup cluttered with dirty double-underscores and foul double-hyphens. One of things that put me off of adopting it for such a long time was how eye-gougingly ugly the syntax is. Now, I’m under no illusion that this is a beautiful way to name things.
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