CSS background-color在Firefox中失效问题求助

Hey Catherine, let's break down what you've tested so far and zero in on that Firefox quirk you're dealing with:

What You've Already Troubleshooted #

• Cross-browser validation: Your code works (or nearly works) perfectly across Chrome, Opera, Edge, IE11, and UC Browser
• Isolation via style removal: Stripping out extra styles helped narrow the issue down to Firefox specifically
• Minimal code test: You tried trimming your HTML down to just the core <html>, <head>, and <body> tags to rule out extra markup causing conflicts
• Firefox setting adjustment: You modified the color override setting at Options>General>Language and Appearance>Fonts and Colors>Colors... by switching it to "Never"

Next Steps to Diagnose the Firefox Issue #

Since you've already narrowed it to Firefox, here are some targeted checks to try:

• Check if Firefox's Compatibility View is enabled for your site—this can force outdated rendering that breaks modern code
• Pop open Firefox's Developer Tools (hit F12) and check the Console for any JavaScript errors or CSS warnings that might be unique to Firefox
• In the Developer Tools' Elements panel, inspect the problematic elements to see if your styles are being overridden by Firefox's default styles or user-specific settings
• Clear Firefox's cache and cookies—stale cached assets can sometimes cause unexpected rendering glitches that don't show up in other browsers
• Verify that any CSS properties or HTML features you're using are supported in your target version of Firefox (some newer features might need vendor prefixes or have partial support)

内容的提问来源于stack exchange，提问作者Catherine