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- changes of state
- awareness - know it's there
- legibility - no unpleasant side-effects (i.e. flashing)
- modality independent
- structures and relationships
- you can interact with it - you have full range of action to use something
- modality independent - accomplishing the same function regardless of modality
- if something is non-operable - it can't be "reached" accessed
- knowing what something does in its context
- i.e. what is its scope? what does it act upon?
- how would this be communicated in multiple modalities? Visually it may be "obvious".
- issue of cognition - i.e. understanding the text
- understand what the author intended to communicate
- consider alternatives to content
- understandable regardless of experience
- learnable - something may not be previously experienced. Therefore it should be learnable.
- as simple / complex as required. No more no less.
- communication of affordances.
- Doesn't break - flexible, forgiving, recoverable
- Flexibility example: i.e. postal code or phone number inputs on forms
- Example of a good implementation: Amazon address change
- Use a suitable control for constrained input (i.e. use a date picker for dates, and not a text field). Reduce validation and validation errors.
- Content and controls works across many platforms / technologies ~ "Graceful degradation"
- States are communicated clearly (i.e. if an error occurs)
- Survive environmental changes (i.e. changes to screen size, browsers etc.
- Placeholder text
- placeholder should describe the text format
- problem: placeholder text often used as labels or descriptions.
- motivation to save some space
- Proper usage of placeholder text?
- Disappears after you start entering text
- What is being communicated by the greyed-out text?
- Differentiating from text the user entered vs. a prompt.
- How do ATs handle placeholder text?
- often gets lumped in with the label, or even substitutes for a label if label is absent.
- Disabled controls
- What is being communicated?