44 lines
2.4 KiB
Markdown
44 lines
2.4 KiB
Markdown
---
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post_title: CSS SASS coding guidelines and naming conventions
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tags: reference
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---
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Our guidelines are based on those used in [Calypso](https://github.com/Automattic/wp-calypso) which itself follows the BEM methodology. Refer to [this doc](https://wpcalypso.wordpress.com/devdocs/docs/coding-guidelines/css.md?term=css) for full details. There are a few differences in WooCommerce however which are outlined below;
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## Prefixing
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As a WordPress plugin WooCommerce has to play nicely with WordPress core and other plugins / themes. To minimise conflict potential all classes should be prefixed with `.woocommerce-`.
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## Class names
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Calypso is built in React and uses component names to formulate CSS class names. WooCommerce Core has none of these components so uses a more traditional [BEM](http://getbem.com/) approach to [naming classes](http://cssguidelin.es/#bem-like-naming).
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When adding classes just remember;
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* **Block** - Standalone entity that is meaningful on its own.
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* **Element** - Parts of a block and have no standalone meaning. They are semantically tied to its block.
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* **Modifier** - Flags on blocks or elements. Use them to change appearance or behaviour.
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### Example
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* `.woocommerce-loop {}` (block).
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* `.woocommerce-loop-product {}` (nested block).
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* `.woocommerce-loop-product--sale {}` (modifier).
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* `.woocommerce-loop-product__link {}` (element).
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* `.woocommerce-loop-product__title {}` (element).
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* `.woocommerce-loop-product__price {}` (element).
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* `.woocommerce-loop-product__rating {}` (element).
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* `.woocommerce-loop-product__button-add-to-cart {}` (element).
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* `.woocommerce-loop-product__button-add-to-cart--added {}` (modifier).
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**Note:** `.woocommerce-loop-product` is not the chosen classname _because_ the block is nested within `.woocommerce-loop`. It's to be specific so that we can have separate classes for single products, cart products etc. _Nested blocks do not need to inherit their parents full name_.
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You can read more about BEM key concepts [here](https://en.bem.info/methodology/key-concepts/).
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#### TL;DR
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* Follow the [WP Coding standards for CSS](https://make.wordpress.org/core/handbook/best-practices/coding-standards/css/) unless it contradicts anything here.
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* Follow [Calypso guidelines](https://wpcalypso.wordpress.com/devdocs/docs/coding-guidelines/css.md?term=css).
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* Use BEM for [class names](https://en.bem.info/methodology/naming-convention/).
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* Prefix all the things.
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