[Webkit-unassigned] [Bug 266287] @supports reporting true for `animation-timeline: scroll()` when using CSS nesting

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=266287

--- Comment #7 from Tim Nguyen (:ntim) <ntim at apple.com> ---
This testcase also triggers an assertion on debug builds:

ASSERTION FAILED: topContext().m_parsedProperties.isEmpty()
/Volumes/Data/Code/Safari/OpenSource/Source/WebCore/css/parser/CSSParserImpl.cpp(254) : bool WebCore::CSSParserImpl::supportsDeclaration(CSSParserTokenRange &)
1   0x138ec3b20 WTFCrash
2   0x2832d8254 WTFCrashWithInfo(int, char const*, char const*, int)
3   0x28396c708 WebCore::CSSParserImpl::supportsDeclaration(WebCore::CSSParserTokenRange&)
4   0x283a6657c WebCore::CSSSupportsParser::consumeSupportsFeatureOrGeneralEnclosed(WebCore::CSSParserTokenRange&)
5   0x283a66850 WebCore::CSSSupportsParser::consumeConditionInParenthesis(WebCore::CSSParserTokenRange&, WebCore::CSSParserTokenType)
6   0x283a66164 WebCore::CSSSupportsParser::consumeCondition(WebCore::CSSParserTokenRange)
7   0x283a65fc4 WebCore::CSSSupportsParser::supportsCondition(WebCore::CSSParserTokenRange, WebCore::CSSParserImpl&, WebCore::CSSSupportsParser::SupportsParsingMode, WebCore::CSSParserEnum::IsNestedContext)
8   0x28396df2c WebCore::CSSParserImpl::consumeSupportsRule(WebCore::CSSParserTokenRange, WebCore::CSSParserTokenRange)
9   0x28396b2c0 WebCore::CSSParserImpl::consumeAtRule(WebCore::CSSParserTokenRange&, WebCore::CSSParserImpl::AllowedRulesType)
10  0x283974b14 WebCore::CSSParserImpl::consumeBlockContent(WebCore::CSSParserTokenRange, WebCore::StyleRuleType, WebCore::CSSParserImpl::OnlyDeclarations, WebCore::CSSParserImpl::ParsingStyleDeclarationsInRuleList)
11  0x283975284 WebCore::CSSParserImpl::consumeStyleBlock(WebCore::CSSParserTokenRange, WebCore::StyleRuleType, WebCore::CSSParserImpl::ParsingStyleDeclarationsInRuleList)
12  0x283988dfc WebCore::CSSParserImpl::consumeStyleRule(WebCore::CSSParserTokenRange, WebCore::CSSParserTokenRange)::$_1::operator()() const
13  0x2839746e4 void WebCore::CSSParserImpl::runInNewNestingContext<WebCore::CSSParserImpl::consumeStyleRule(WebCore::CSSParserTokenRange, WebCore::CSSParserTokenRange)::$_1>(WebCore::CSSParserImpl::consumeStyleRule(WebCore::CSSParserTokenRange, WebCore::CSSParserTokenRange)::$_1&&)

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