I’ve dealt with this exact custom font loading headache in APEX before— let’s walk through the fixes step by step:

• Fix the format values in @font-face
  This is the most common mistake! Your CSS uses format('ttf') but the correct value for TrueType fonts is 'truetype'. Browsers rely on these format hints to decode fonts properly, so mismatches cause the "failed to decode" error. Update your CSS to this:

  @font-face {
    font-family: 'MyWebFont';
    /* Prioritize smaller WOFF2 first for faster loading */
    src: url('#WORKSPACE_IMAGES#Pacifico.woff2') format('woff2'),
         url('#WORKSPACE_IMAGES#Pacifico.woff') format('woff'),
         url('#WORKSPACE_IMAGES#Pacifico.ttf') format('truetype');
    /* Add these to avoid inheritance conflicts */
    font-weight: normal;
    font-style: normal;
  }
  
  body {
    font-family: 'MyWebFont', sans-serif;
    font-weight: 300;
    line-height: 25px;
    font-size: 14px;
  }
  

• Verify font file upload & path sensitivity
  Oracle APEX is case-sensitive with file paths— double-check that:

  1. Your Pacifico.ttf, Pacifico.woff, and Pacifico.woff2 are actually uploaded to your workspace’s Images section.
  2. The filenames in your CSS match the uploaded files exactly (e.g., Pacifico.ttf vs pacifico.ttf will break things).
  3. Hard-refresh Chrome (Ctrl+Shift+R) to clear cached old font files that might be corrupted.

• Switch to Application Static Files instead of Workspace Images
  Sometimes workspace-level image paths have permission or parsing quirks. Try uploading your font files to your app’s Application Static Files (under Shared Components > Static Files) and update the URL to use #APP_IMAGES# instead:

  src: url('#APP_IMAGES#Pacifico.woff2') format('woff2'),
  

• Check for corrupted font files
  If your converted WOFF/WOFF2 files are damaged, Chrome can’t decode them. Try:

  • Using a reliable web font conversion tool to re-generate the files (make sure the output files open correctly on your local machine).
  • Downloading the official Pacifico web font package directly (skip manual conversion entirely if possible).

• Validate MIME Types in Chrome DevTools
  Chrome 74 requires correct Content-Type headers for fonts. Open DevTools > Network tab, reload the page, and check the Response Headers for your font files:

  • WOFF2 should show Content-Type: font/woff2
  • WOFF should show Content-Type: application/font-woff
  • TTF should show Content-Type: font/truetype
    If these are missing or incorrect, work with your server admin to configure the correct MIME types for your APEX environment.

• Confirm no CSS conflicts
  Use Chrome DevTools’ Elements tab to inspect the body element’s Computed styles. Ensure MyWebFont is listed as the active font (not falling back to sans-serif). If another CSS rule is overriding your font-family, adjust the specificity of your selector (e.g., use html body instead of just body).

内容的提问来源于stack exchange，提问作者Arun Palanisamy