Challenges of supporting RTL languages

LTR text inside RTL contexts

Paths (e.g., C:\Users\username\Desktop)
Full URLs (Check out the %1$@ on GOAT %URL)
Telephone numbers: 987 654-3210 or Starts with punctuation +19876543210
Usernames & passwords (most sites on the web expect LTR usernames/passwords, but there may be exceptions)
Other text fields where only LTR text is expected

Placeholder checklist:

Numbers and English in Placeholder (e.g. Address %s= 15 Bay Street, Laurel, CA)

Western/Eastern Arabic numerals: TBC
Breaking Up Large Numbers
Currency Localization: Some locales place the currency symbol to the left of the number, while others place the symbol to the right (EURO).
Percentages: Arabic percent sign go to the left of its associated number

layout mirroring: right-aligned menus, right-aligned text, drawable positioning, dialogs and forward arrows pointing to the left.
Graphics, icons
- Product images – esp. Shoes’ direction
- Icons that imply directionality like back/forward buttons
  - Exception?: Instant ->
- Icons that imply text direction, like readerMode.svg
- Icons that imply location of UI elements in the screen, like sidebars-right.svg, open-in-new.svg, default-theme.svg or pane-collapse.svg
- Icons representing objects that are meant to be handheld should look like they’re being right-handed, like the magnifying glass icon
Not to mirror:
- English Text/numbers
- Icons/animations that are direction neutral
- Icons that wouldn’t look differently if they’d be mirrored, like X buttons or the bookmark star icon
- Icons that should look the same as LTR, like icons related to code (which is always LTR) like tool-webconsole.svg
- Checkmark icons
- Video/audio player controls
- Product logos
- Order of size dimensions (e.g., 1920×1080 should not become 1080×1920)
- Order of size units (e.g., 10 px should not become px 10 (unless the size unit is localizable))

Source:

Tips:

作者：陳奇諾