User Experience
Mobile First
Plain English
It means starting with the smallest screen so the essentials are clear first.
Definition
Mobile first is the practice of designing for the smallest screen before glossaryScalingScaling is the process of growing a product or system to handle increased demand without compromising performance or experience. It applies to technology, users, and operations.Open glossary term up to larger ones. The constraint forces early decisions about what matters most, and those decisions then carry through to every other size.
In practice
Used to prioritise simplicity and glossaryConstraintsConstraints are limitations or restrictions that impact how a product or solution can be designed or built.Open glossary term.
In context
The discipline is in the constraint, not the device. Deciding what survives on a small screen forces the glossaryPrioritisationPrioritisation is the process of ranking tasks, features, or initiatives based on their importance, impact, and effort.Open glossary term that a wide glossaryLayoutLayout is the arrangement of elements on a page or screen, determining how content is organised and presented. It influences readability, usability, and overall experience.Open glossary term lets you avoid.
The reality
If ignored, mobile suffers.
Compared with
Mobile First vs Mobile Friendly
Mobile friendly means the desktop experience works acceptably on a phone. Mobile first means the small screen shaped the decisions and larger ones were built up from it. The results differ most in what got cut.
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