docs(hydration errors): Add a FAQ entry about strange html diffs #14672
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1 Skipped Deployment
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Bundle ReportChanges will increase total bundle size by 3.52kB (0.02%) ⬆️. This is within the configured threshold ✅ Detailed changes
Affected Assets, Files, and Routes:view changes for bundle: sentry-docs-server-cjsAssets Changed:
view changes for bundle: sentry-docs-client-array-pushAssets Changed:
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docs/product/issues/issue-details/replay-issues/hydration-error.mdx
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| The class name `:hover` was added Session Replay when it serialized the page, React didn't see this class and it has no impact on hydration. This means the user was hovering and interacting with the page before react was finished hydrating (this is the whole point of hydration; to make the page react for interaction sooner!). By the time hydration was complete the user had moved their mouse so the :hover class is changed. |
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| The class name `:hover` was added Session Replay when it serialized the page, React didn't see this class and it has no impact on hydration. This means the user was hovering and interacting with the page before react was finished hydrating (this is the whole point of hydration; to make the page react for interaction sooner!). By the time hydration was complete the user had moved their mouse so the :hover class is changed. | |
| The class name `:hover` was added by the Replay SDK when it serialized the page. React didn't see this class and it has no impact on hydration. This means the user was hovering and interacting with the page before React was finished hydrating (this is the whole point of hydration; to make the page react for interaction sooner!). By the time hydration was complete, the user had moved their mouse, so the `:hover` class is changed. |
to? by?
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i think by, in the sentence it's doing the thing.
added to the serialized json.. like 'added to the [serialzied] replay [data]'
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could do 'by the replay sdk`
michellewzhang
approved these changes
Aug 15, 2025
Co-authored-by: Michelle Zhang <56095982+michellewzhang@users.noreply.github.com>
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The original ticket was something like "Sentry raises attribute order or empty spaces in values as Hydration errors that have no effect on the HTML rendering"
I wrote a response on the ticket, but since this is a common enough thing I think it should be in the FAQ too. It's a good question that we've gotten before.
Fixes getsentry/sentry#97828