Full-Width Space Marker iOS Last updated: July 31, 2026

Full-Width Space Marker Support

Full-Width Space Marker is an iPhone Safari extension that highlights full-width spaces on web pages.

Get started

  • On iPhone, open Settings, then Apps, Safari, and Extensions.
  • Turn on Full-Width Space Marker and allow access to the websites where you want to use it.
  • Open the main app and confirm that Enable Highlighting is on.
  • Reload the page in Safari.

Verification text

The following line contains one full-width space between Check and Target. Enable the extension and reload this page in Safari to highlight it.

Check Target

If highlighting does not appear

  • Check that the extension and website access are allowed in Safari's extension settings.
  • Check the global switch in the app and the site-specific switch in Safari's extension menu.
  • Reload the page. Some areas may not be supported because of a page's structure or restrictions.

Resetting and deleting settings

Use Reset to Defaults in the app to reset display settings. Deleting the app also causes iOS to delete settings stored on the device by the app and extension.

Contact

For questions about Full-Width Space Marker, please contact CAEN Inc. by email.

info@caen.co.jp