<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/85780>85780</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            `llvm-cov export --format=html` is documented, but not implemented
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          dilyanpalauzov
      </td>
    </tr>
</table>

<pre>
    For v18.1.1 `llvm-cov export --help` prints
```
  --format=<value>                   - Output format for line-based coverage reports
    =text                            -   Text output
    =html                            -   HTML output
    =lcov -   lcov tracefile output
```

This suggests that the command below is valid
> $ llvm-cov export test --format=html --instr-profile=uu.profdata

it prints however
> error: coverage data can only be exported as textual JSON or an lcov tracefile.

and has exits code 1.
 
</pre>
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