Dropdown: Usage tab

[sstrubberg]

Ref original issue: https://github.com/carbon-design-system/carbon-website/issues/3363 Usage tab PDF comments: https://ibm.box.com/s/q1ytxjunn1dhhyyk6nr7p8lpwg2iy2hw

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Update these areas on the Usage tab

• Description: Consider revising the description to make it more clear.
• Overview: See if we should/should not add information about the difference between dropdown and select here or mention this more later in the docs.
• Variants section (Combobox purpose): Revise this content to make it more clear.
• When to use section: Explain briefly what native means.
• Sizing section: Look into if we normally specify the "default" size that we use in the image itself for other form components, or if we only mention it in the content.
• Content section:
  • Options in a menu: Revise this content with the suggestions in the PDF.
• Optional versus required fields: Add some more details here.
• Overflow content section: Is a browser based tooltip not an accessible affordance compared to an actual tooltip? Ask Michael Gower for more information to clarify which one we need to use.
• Interactions section (mouse and keyboard):
  • Combo box: Don't mention the speed of typing in this bullet point.
  • Multiple selection: Revise this section with suggestions.

[laurenmrice]

Questions for a11y to share at CAG guild:

• [x] Placeholder text: We need to discuss whether to remove it from the dropdown field as a prompt, or add it to the dropdown list.

  • Note: We have removed it from the React demos for Multiselect Filterable, Combobox, and the Select component. But it not removed from the actual code.
  • Updating fields in Dropdown to have no placeholder text is considered a breaking change and can not be implemented right now in code. Created a separate issue to tackle the removal of placeholder text https://github.com/carbon-design-system/carbon-website/issues/3662
• [x] Variants of the same component: Should select and dropdown be variants of the same component?
  • We will investigate this in the future and not in this issue.
• [x] Keyboard: Should we use Space to select/deselect checkboxes in the multiselect.
  • This seems to have already been resolved. See storybook