API design guidelines

jQuery Core tenets:

• Provide a set of APIs that work consistently across supported browsers.
• Document exceptions where consistency is impractical or impossible.
• Work with browser makers to the web platform behave consistently.

jQuery API tenets:

• Avoid Boolean traps.
• Undocumented inputs result in unpredictable output - The API may throw an error inside jQuery, do nothing, or have some unpredictable behavior. This may change without warning across versions, even minor patches.
• Use .api(name) for getters and .api(name, value) for setters.
• A getter on an empty jQuery collection returns undefined.