Member Avatar for Esther01

I am making a page from a template.
This is my first try at it.
The page first displayed correctly in FF, but would not work in IE, then I made some changes (not even sure really what I did)
But now the page only displays in IE & Chrome but NOT FF.
Any suggestions what to check???
Thanks!

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  • Latest Post Latest Post by cfajohnson

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A focused checklist and quick debug workflow to find why a page that once worked in Firefox now only renders in IE and Chrome. As noted, a URL or a minimal code sample speeds diagnosis; and was right to push validation — start there, then try the targeted checks below.

  • Confirm the very first bytes of the HTML. A standards DOCTYPE is best; make sure nothing (not even a BOM or stray whitespace) appears before it:

    <!DOCTYPE html>

  • Look for unclosed comments or blocks. An unclosed HTML comment or an unclosed CSS comment in a linked stylesheet will commonly stop Firefox from parsing the rest of the document:

    <!-- forgot to close this comment
    /* unclosed CSS comment
.site { margin:0; }

  • Use Firefox Developer Tools (Console + Inspector + Network). Console errors (parsing, XML, or JS) and failed network requests for CSS/JS will be visible there. Firefox is stricter about some parsing and MIME rules.

  • Check markup structure with the DOM inspector. Browsers recover from malformed HTML differently; look for elements that end up nested or discarded in Firefox but not in Chrome.

  • Isolate the change: revert to the last known-good copy or create a reduced test page that reproduces the problem. Apply recent edits one-by-one (binary search) to find the offending change.

If those steps don’t find it, post a reduced, self-contained test case (the minimal HTML + the related CSS) and the exact Firefox version and OS. That will let others reproduce the failure quickly and point to the exact line or rule that breaks Firefox.

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Member Avatar for tweak

We need to see some code or a link to the site before anyone can make a suggestion on what might be the problem preferably both.

Member Avatar for cfajohnson

Before you do anything else, check with http://validator.w3.org that your code is correct. If it isn't, fix it, then post a URL here if there are still problems.

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