CSS Toggles Explainer & Proposal

CSS Toggles Explainer & Proposal

css.oddbird.net css.oddbird.net3 months ago in #Dev Love55

Authors ¶ Miriam Suzanne Tab Atkins Jr. See the References & Acknowledgements for added members and prior artwork Participate ¶ Unofficial draft specification Github problems for draft spec CSSWG monitoring factor OddBird JS polyfill/prototype (and demo) Introduction ¶ There are many use-cases the place an interplay (click on/gesture) on one part toggles a ‘state’ that may be shared with different components. This can vary from toggling mild/darkish mode, to activating slide-in navigation, opening and shutting menus, or interacting with sectioned content material as tabs, accordions, or carousels. HTML additionally supplies the part, with a “checked” state that toggles between true and false when the person turns on the part, and which can also be decided on through the :checked pseudoclass. These situations lately require customized Javascript, which provides a barrier for authors another way succesful of imposing the visible design – and ceaselessly ends up in much less performant, much less available answers. We suggest generalizing the trend in order that it may be implemented to any part the usage of a declarative syntax in CSS, with integrated accessibility and efficiency. Goals [or Motivating Use Cases, or Scenarios] ¶ To borrow language from Nicole Sullivan: a gesture on a cause reasons a state trade on a goal Where: a gesture is typically some type of person interplay, like click on/input activation, scrolling, and many others. It can be helpful to believe non-user ‘gestures’ equivalent to animation occasions that cause a toggle state. a cause and a goal are each components within the DOM (ceaselessly other components, however every so often the similar part) a state trade can also be transferring via a listing of conceivable states, or environment a selected state Several of the anticipated use-cases contain appearing and hiding content material according to the state of a toggle: tabs accordions / tree perspectives carousels popups dialogs abstract/main points off-canvas menus However, there also are use-cases for a toggle to have extra advanced taste affect: mild/darkish/high-contrast/auto colour subject matters adjusting font sizes adjusting compact/comfy spacing adjusting ‘perspectives’, eg calendar/schedule or horizontal/vertical format The Open UI challenge has been running on new components/attributes that might lend a hand with a few of these use-cases at a excessive degree – equivalent to panel units (‘highly spiced sections’), selectmenus, and popups. It’s our function that CSS toggles supply some shared capability that the ones components & attributes can depend on, whilst additionally giving authors get admission to to outline new toggle-based patterns. Along the best way, we have now a couple of targets for how this selection must paintings: Accessibility must be treated internally on every occasion conceivable, relatively than depending on creator intervention Relationships between a cause and its affect must be established and accessed in CSS, relatively than depending on distinctive IDs or selectors-as-property-values. JS must no longer be required in the most typical use-cases Defaults must lend a hand facilitate the most typical use-cases,  » Read More

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