/src/main/java/org/htmlunit/html/HtmlUnknownElement.java
if ( getPage( ).getWebClient( ).getBrowserVersion( ).hasFeature( SLOT_CONTENTS) ) {   return DisplayStyle.CONTENTS; }
[Delete]
if (!hasFeature(CSS_RT_DISPLAY_RUBY_TEXT_ALWAYS) && wasCreatedByJavascript() && getParentNode() == null) { return DisplayStyle.BLOCK; } return DisplayStyle.RUBY_BASE; case HtmlRp.TAG_NAME: <extra_id_0> return DisplayStyle.NONE; } if (wasCreatedByJavascript() && getParentNode() == null) { return DisplayStyle.BLOCK; } break;