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LibWeb: Make HTMLIFrameElement.sandbox.supports() not throw

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We have to list the set of allowed values for the DOMTokenList to not
throw when asking if one is supported.

This fixes an issue where YouTube embeds would hang indefinitely trying
to report an endless series of exceptions, seen on https://null.com/
This commit is contained in:
Andreas Kling 2024-12-03 12:00:35 +01:00 • committed by Andreas Kling
commit a7b3360fb6
Notes: github-actions[bot] 2024-12-03 14:31:06 +00:00
2 changed files with 4 additions and 2 deletions
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1
Libraries/LibWeb/DOM/DOMTokenList.cpp
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@ -214,6 +214,7 @@ WebIDL::ExceptionOr<bool> DOMTokenList::supports(StringView token)
static HashMap<FlyString, Vector<StringView>> supported_tokens_map = {
// NOTE: The supported values for rel were taken from HTMLLinkElement::Relationship
{ HTML::AttributeNames::rel, { "alternate"sv, "stylesheet"sv, "preload"sv, "dns-prefetch"sv, "preconnect"sv, "icon"sv } },
{ HTML::AttributeNames::sandbox, { "allow-downloads"sv, "allow-forms"sv, "allow-modals"sv, "allow-orientation-lock"sv, "allow-pointer-lock"sv, "allow-popups"sv, "allow-popups-to-escape-sandbox"sv, "allow-presentation"sv, "allow-same-origin"sv, "allow-scripts"sv, "allow-top-navigation"sv, "allow-top-navigation-by-user-activation"sv, "allow-top-navigation-to-custom-protocols"sv } },
};
// 1. If the associated attribute’s local name does not define supported tokens, throw a TypeError.