<thead> element removed from <table> if there are no <tbody> or <tr> elements
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Description
Using the default config, the <thead> element from a <table> will be removed, if there are no other <tbody> or <tr> elements in the <table>.
According to the HTML Living Standard and the W3C Recommendation it is valid to have a <table> element with only a <thead> child.
Here are two Live Demos demonstrating the bug:
Bug
Expected Output
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the issue with the provided Bug and Expected Output live demos, then trace the table-element handling in HTMLPurifier. Compare the behavior with the linked HTML standards; done means a table containing only a thead is preserved under the default configuration.
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Assessment
- Tech stack
- php
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100