The same CSS and JavaScript can render subtly differently across browser engines — a flexbox gap that Safari interprets one way and Chrome another, a shadow that renders sharper in Firefox — and most of these differences are invisible until someone actually opens the site in the specific browser affected, which is rarely the one you personally use every day to check your own work. It’s a genuinely easy blind spot to have, since nobody builds or checks a site primarily in a browser they don’t personally favour, which means the exact combinations most likely to differ are also the ones least likely to get caught during ordinary development.
Why there’s no single check to run first
A cross-browser audit only earns its keep by covering ground you likely haven’t already looked at yourself, so substituting a quick check in one browser would just confirm what you probably already know.
If you already have server logs or analytics showing which browsers your actual visitors use, sharing that narrows our testing toward what genuinely matters for your traffic, rather than testing every browser equally regardless of whether anyone uses it.
It’s also worth thinking about whether your site has any particularly complex visual elements — custom animations, unusual layout techniques, heavy use of newer CSS features — since those tend to be exactly where browser engines diverge most noticeably from each other. A site built mostly from plain text and standard layouts tends to show fewer surprises than one leaning heavily on newer, more experimental techniques. Neither situation is a problem in itself, just a difference in how much there realistically is to find.
Cross-browser rendering audit & fix list
A systematic pass across the browsers your visitors actually use, cataloguing rendering differences and delivering a prioritised fix list.
- Full backup taken before we start
- If we can’t fix it, you get your money back
- We never ask for your own password
This or something else?
| You want a systematic cross-browser check across your key pages | This fix covers it |
| You already know of one specific rendering bug in one specific browser | A more targeted, single-issue fix for that browser |
| You want mobile and tablet viewports checked specifically, not desktop browsers | Mobile & tablet viewport QA sweep, a related but distinct service |
| You want forms specifically tested end-to-end, not general rendering | Form submission end-to-end testing, a different service |
| The site is visibly broken in every browser right now | A specific fault diagnosis, not this audit |
What we need from you
- The key pages or templates you most want checked
- Any browsers you already know matter most for your visitors, from analytics if available
- Whether you want issues fixed as found, or a full report before any changes
What we do
- Test the specified pages across the major desktop and mobile browser engines
- Document every rendering inconsistency found, with screenshots and the specific browser involved
- Trace each inconsistency to its likely CSS or script-level cause
- Prioritise the list by visible impact rather than technical severity alone
- Fix straightforward, low-risk issues directly where the cause is clear
- Deliver a written report covering findings, fixes made, and anything needing a decision from you
What is included
- A systematic rendering check across the browsers that matter for your visitors
- Each inconsistency documented with screenshots and traced to its cause
- Straightforward, low-risk issues fixed directly
- A written report prioritising findings by real-world visible impact
Not included
- Fixing every issue found, if some require a larger follow-up decision from you
- Ongoing monitoring as browsers themselves release new versions
- Testing browsers with negligible traffic share for your specific site
- Rebuilding a design that was never intended to look identical across every engine
Questions about this fix
Do I need to know which browsers to check, or do you decide?
We're happy to test the common ones by default, but if you have any visitor data at all, even rough, it helps us weight the testing toward what your actual audience uses rather than a generic list.
Will every difference between browsers get fixed?
Not necessarily — some differences are cosmetic and genuinely not worth chasing, so the report separates what's worth fixing from what's technically different but practically invisible to a real visitor.
Does this cover older browser versions too, or just the latest?
We test what's realistic for your traffic, which usually means recent versions, though we'll flag it if your analytics show a meaningful share still on something older.
Why does this happen even though I built the site carefully?
Browser engines genuinely interpret some CSS and JavaScript specifications slightly differently by design, so this isn't a sign of anything done wrong, just an inherent quirk of the web platform.
Can this be done on a staging copy instead of the live site?
Yes, and it's often preferable, since it lets us flag anything before it's visible to real visitors rather than after.
Related fixes
If this is the second time this year
A bad update breaking the site is a symptom of updates not being tested first. Care plans run every update on a staging clone before it reaches your live site, which is the actual fix for this happening again.
Your access, your rules
Create a separate admin account for us and delete it when we are done. For anything else, we get in touch and agree a method — never a form field on this site, never by reply to an email.
We back up first, always
Before anything is touched we take a full backup and keep it for 30 days. If a fix goes wrong, we put the site back exactly as it was.
If it is not what you bought
If the problem turns out smaller than what you ordered, we refund the difference. If it is bigger, we stop and send a quote before doing any extra work.
If we cannot fix it
You get back what we received. Diagnosis is on us — you only pay when the problem is actually solved. The payment processor takes its fee before the money reaches us, so we never hold it and it is not ours to return. That is true here as everywhere else.
If it comes back
Reply within seven days of delivery and we put it back on the bench at no cost. The fix is not finished until it holds.
What we are responsible for
If something goes wrong with a fix, our responsibility is limited to what you paid for it. We take a full backup first so mistakes can be undone, and we tell you before doing anything outside what you bought.