dosubot[bot] commented on issue #30381:
URL: https://github.com/apache/superset/issues/30381#issuecomment-2372571121
<!-- Answer -->
The issue you're encountering with the `class` attribute being blank is
likely due to the fact that the `xss` library, which is used for HTML
sanitization in Superset, does not recognize the `className` attribute.
Instead, it uses the `class` attribute.
To resolve this, you should update your
`HTML_SANITIZATION_SCHEMA_EXTENSIONS` configuration to use the `class`
attribute instead of `className`. Here is the corrected configuration:
```python
HTML_SANITIZATION = True
HTML_SANITIZATION_SCHEMA_EXTENSIONS = {
"attributes": {
"*": ["style", "class"],
},
"tagNames": ["style"],
}
```
With this configuration, the `class` attribute should be preserved in the
processed HTML template, allowing your CSS to be applied correctly.
Make sure to restart Superset after making these changes to ensure the new
configuration is loaded.
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