protected void checkAttribute( @NotNull final XmlAttribute attribute, @NotNull final ProblemsHolder holder, final boolean isOnTheFly) { final XmlTag tag = attribute.getParent(); if (tag instanceof HtmlTag) { XmlElementDescriptor elementDescriptor = tag.getDescriptor(); if (elementDescriptor == null || elementDescriptor instanceof AnyXmlElementDescriptor) { return; } XmlAttributeDescriptor attributeDescriptor = elementDescriptor.getAttributeDescriptor(attribute); final String name = attribute.getName(); if (attributeDescriptor == null && !attribute.isNamespaceDeclaration()) { if (!XmlUtil.attributeFromTemplateFramework(name, tag) && (!isCustomValuesEnabled() || !isCustomValue(name))) { final ASTNode node = attribute.getNode(); assert node != null; final PsiElement nameElement = XmlChildRole.ATTRIBUTE_NAME_FINDER.findChild(node).getPsi(); boolean maySwitchToHtml5 = HtmlUtil.isCustomHtml5Attribute(name) && !HtmlUtil.hasNonHtml5Doctype(tag); LocalQuickFix[] quickfixes = new LocalQuickFix[maySwitchToHtml5 ? 3 : 2]; quickfixes[0] = new AddCustomTagOrAttributeIntentionAction( getShortName(), name, XmlEntitiesInspection.UNKNOWN_ATTRIBUTE); quickfixes[1] = new RemoveAttributeIntentionAction(name); if (maySwitchToHtml5) { quickfixes[2] = new SwitchToHtml5WithHighPriorityAction(); } holder.registerProblem( nameElement, XmlErrorMessages.message("attribute.is.not.allowed.here", name), ProblemHighlightType.GENERIC_ERROR_OR_WARNING, quickfixes); } } } }