6 files declare their use of WebformHtmlHelper in Webform 8.5

TextBase.php in src/Plugin/WebformElement/TextBase.php

webform.tokens.inc in ./webform.tokens.inc

Builds placeholder replacement tokens for webforms and submissions.

WebformComputedBase.php in src/Element/WebformComputedBase.php

WebformElementBase.php in src/Plugin/WebformElementBase.php

WebformHtmlHelperTest.php in tests/src/Unit/Utility/WebformHtmlHelperTest.php

WebformTwigExtension.php in src/Twig/WebformTwigExtension.php