From d0312f6208cd20c121d8e0cdc63379407ea2b2d9 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Tue, 23 Jun 2020 20:06:45 +0200
Subject: [PATCH] LibWeb: Handle empty inputs to the CSS parser

Empty inputs -> empty outputs.
---
 Libraries/LibWeb/Parser/CSSParser.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Libraries/LibWeb/Parser/CSSParser.cpp b/Libraries/LibWeb/Parser/CSSParser.cpp
index 490f0c15ab..d7b1ef3e3e 100644
--- a/Libraries/LibWeb/Parser/CSSParser.cpp
+++ b/Libraries/LibWeb/Parser/CSSParser.cpp
@@ -859,12 +859,16 @@ Optional<Selector> parse_selector(const StringView& selector_text)
 
 RefPtr<StyleSheet> parse_css(const StringView& css)
 {
+    if (css.is_empty())
+        return StyleSheet::create({});
     CSSParser parser(css);
     return parser.parse_sheet();
 }
 
 RefPtr<StyleDeclaration> parse_css_declaration(const StringView& css)
 {
+    if (css.is_empty())
+        return StyleDeclaration::create({});
     CSSParser parser(css);
     return parser.parse_standalone_declaration();
 }