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Adding link in Issue Summary about a single underscore in a class name.
Drupal’s new CSS coding standards recommend a naming convention for classes which requires the use of double-underscores as separators in certain cases. However, Drupal currently processes some classes internally using drupal_clean_css_identifier(), which replaces all underscores with dashes.
Allow double underscores to pass through drupal_clean_css_identifier untouched, if the allow_css_double_underscores variable is enabled. Because many modules rely on the current behavior of this function in order to generate standard dash-separated class names from php strings such as field_name (and this does not need to change), we should for the time being retain the existing behaviour for single underscores.
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Overly aggressive transliteration in drupal_clean_css_identifier removes underscores from classes
Closed: duplicate
exists to discuss altering the treatment of single underscores.
Update august 2025: About transforming a single underscore into a dash, see 🐛 Views row class filtering underscore to dash on direct input Active .
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#1995272: [Meta] Refactor module CSS files inline with our CSS standards →
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Overly aggressive transliteration in drupal_clean_css_identifier removes underscores from classes
Closed: duplicate
Fixed
7.0 ⚰️
theme system
Issue related to Drupal on mobile devices.
It affects performance. It is often combined with the Needs profiling tag.
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Adding link in Issue Summary about a single underscore in a class name.