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Traps to Developers
A summarization of some traps to developers. There traps are unintuitive things that are easily misunderstood and cause bugs.
It's recommended to specify width and height attribute in<img> to avoid layout shift due to image loading delay. See also In MySQL (InnoDB), if string field doesn't have character set utf8mb4 then it will error if you try to insert a text containing 4-byte UTF-8 code point. In PostgreSQL, if in repeatable read level, application checks using select ... for update then insert, it's not sufficient to enforce constraint under concurrency (due to write skew).
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