Bottom line: the most damaging web development mistakes are not cosmetic imperfections. They are failures that break a critical customer journey, make search or measurement unreliable, create security or accessibility risk, or leave the team unable to release and recover safely. Fix those before polishing lower-risk details.
If you are auditing a business website, start with three questions: Can a person complete the job they came to do? Can search and measurement systems access and record the experience correctly? Can your team change the site and roll back safely? Those questions catch more consequential problems than a generic checklist of design pet peeves.
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