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HTMLSemanticPreservingSplitter processes malformed and unsafe links
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### Submission checklist
- [x] This is a bug, not a usage question.
- [x] I added a clear and descriptive title that summarizes this issue.
- [x] I used the GitHub search to find a similar question and didn't find it.
- [x] I am sure that this is a bug in LangChain rather than my code.
- [x] The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).
- [x] This is not related to the langchain-community package.
- [x] I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS.
### Package (Required)
- [ ] langchain
- [ ] langchain-openai
- [ ] langchain-anthropic
- [ ] langchain-classic
- [ ] langchain-core
- [ ] langchain-model-profiles
- [ ] langchain-tests
- [x] langchain-text-splitters
- [ ] langchain-chroma
- [ ] langchain-deepseek
- [ ] langchain-exa
- [ ] langchain-fireworks
- [ ] langchain-groq
- [ ] langchain-huggingface
- [ ] langchain-mistralai
- [ ] langchain-nomic
- [ ] langchain-ollama
- [ ] langchain-openrouter
- [ ] langchain-perplexity
- [ ] langchain-qdrant
- [ ] langchain-xai
- [ ] Other / not sure / general
### Related Issues / PRs
_No response_
### Reproduction Steps / Example Code (Python)
```python
from langchain_text_splitters.html import HTMLSemanticPreservingSplitter
html = """
<html>
<body>
<p><a href="">Empty Link</a></p>
<p><a href="javascript:void(0)">Bad Link</a></p>
<p><a href="https://example.com">Valid Link</a></p>
</body>
</html>
"""
splitter = HTMLSemanticPreservingSplitter(
headers_to_split_on=[("h1", "Header 1")],
preserve_links=True,
)
docs = splitter.split_text(html)
for doc in docs:
print(doc.page_content)
```
### Error Message and Stack Trace (if applicable)
```shell
```
### Description
`HTMLSemanticPreservingSplitter` currently processes malformed or unsafe links such as empty `href` values and `javascript:` pseudo-links.
This can generate invalid markdown links and unintentionally preserve unsafe…
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