NOTE I now use the conventions detailed in the SUIT framework
Used to provide structural templates.
Pattern
t-template-name
t-template-name--modifier-name
t-template-name__subcomponent-name--subcomponent-modifier-name
Examples
t-icon
t-icon--large
t-btn
t-btn--large
t-media
t-media__img
t-media__img--large
t-media__opt
t-media__body
Used to indicate the state of a component
Pattern
is-state-type
Examples
is-hidden
is-collapsed
is-expanded
is-selected
Used to provide JS-only hooks for a component. Can be used to provide a JS-enhanced UI or to abstract other JS behaviours.
Pattern
js-action-name
Examples
js-submit
js-action-save
js-ui-collapsible
js-ui-dropdown
js-ui-dropdown--control
js-ui-dropdown--menu
js-ui-carousel
Could reuse the Template Component naming convention, for example:
specific-name
specific-name--modifier-name
specific-name__subcomponent-name
specific-name__subcomponent-name--subcomponent-modifier-name
Or just let anything go.