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@@ -10,6 +10,7 @@
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#include <LibWeb/DOM/DOMTokenList.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/Element.h>
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+#include <LibWeb/HTML/HTMLLinkElement.h>
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#include <LibWeb/Infra/CharacterTypes.h>
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#include <LibWeb/WebIDL/DOMException.h>
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@@ -211,16 +212,31 @@ WebIDL::ExceptionOr<bool> DOMTokenList::replace(String const& token, String cons
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// https://dom.spec.whatwg.org/#dom-domtokenlist-supports
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// https://dom.spec.whatwg.org/#concept-domtokenlist-validation
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-WebIDL::ExceptionOr<bool> DOMTokenList::supports([[maybe_unused]] StringView token)
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+WebIDL::ExceptionOr<bool> DOMTokenList::supports(StringView token)
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{
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- // FIXME: Implement this fully when any use case defines supported tokens.
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+ static HashMap<FlyString, Vector<StringView>> supported_tokens_map = {
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+ // NOTE: The supported values for rel were taken from HTMLLinkElement::Relationship
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+ { HTML::AttributeNames::rel, { "alternate"sv, "stylesheet"sv, "preload"sv, "dns-prefetch"sv, "preconnect"sv, "icon"sv } },
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+ };
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// 1. If the associated attribute’s local name does not define supported tokens, throw a TypeError.
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- return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, String::formatted("Attribute {} does not define any supported tokens", m_associated_attribute).release_value_but_fixme_should_propagate_errors() };
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+ auto supported_tokens = supported_tokens_map.get(m_associated_attribute);
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+ if (!supported_tokens.has_value())
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+ return WebIDL::SimpleException { WebIDL::SimpleExceptionType::TypeError, MUST(String::formatted("Attribute {} does not define any supported tokens", m_associated_attribute)) };
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+
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+ // AD-HOC: Other browsers return false for rel attributes on non-link elements for all attribute values we currently support.
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+ if (m_associated_attribute == HTML::AttributeNames::rel && !is<HTML::HTMLLinkElement>(*m_associated_element))
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+ return false;
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// 2. Let lowercase token be a copy of token, in ASCII lowercase.
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+ auto lowercase_token = token.to_lowercase_string();
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+
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// 3. If lowercase token is present in supported tokens, return true.
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+ if (supported_tokens->contains_slow(lowercase_token))
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+ return true;
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+
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// 4. Return false.
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+ return false;
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}
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// https://dom.spec.whatwg.org/#dom-domtokenlist-value
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Tim Ledbetter