Why Are My Glyphicons Showing as 'E001' in Bootstrap 3?

Failed to Display Glyphicons Accurately in Bootstrap 3

Encountering problems displaying glyphicons in Bootstrap 3 is not uncommon when migrating from an older version. This issue, where icons appear as 'E001' or similar codes instead of their intended glyph, has been known to affect Firefox in particular.

Cause and Resolution

The root cause of this problem lies in the customized version of Bootstrap. Broken font files included in this customized package prevent glyphicons from displaying correctly.

To resolve this issue, consider the following steps:

• Ensure that you have not selected the customized Bootstrap version.

• If you have, you can manually download the following font files and replace the existing ones with them:

  • https://netdna.bootstrapcdn.com/bootstrap/3.0.0/fonts/glyphicons-halflings-regular.svg
  • https://netdna.bootstrapcdn.com/bootstrap/3.0.0/fonts/glyphicons-halflings-regular.woff
  • https://netdna.bootstrapcdn.com/bootstrap/3.0.0/fonts/glyphicons-halflings-regular.ttf
  • https://netdna.bootstrapcdn.com/bootstrap/3.0.0/fonts/glyphicons-halflings-regular.eot
• Perform a strong reload (CTRL F5) to apply the changes.

By following these steps, you should be able to restore the proper display of glyphicons in Bootstrap 3.

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