Changes suggested in code review

Author: oliverklee

CHANGELOG.md

@@ -36,7 +36,7 @@ Please also have a look at our
 
 ### Removed
 
-- Remove the IE hack in `Rule` (#995))
+- Remove the IE hack in `Rule` (#995)
 - Remove `OutputFormat::level()` (#874)
 - Remove expansion of shorthand properties (#838)
 - Remove `Parser::setCharset/getCharset` (#808)

src/Rule/Rule.php

@@ -86,13 +86,6 @@ public static function parse(ParserState $parserState): Rule
         $parserState->consume(':');
         $value = Value::parseValue($parserState, self::listDelimiterForRule($rule->getRule()));
         $rule->setValue($value);
-        if ($parserState->getSettings()->bLenientParsing) {
-            while ($parserState->comes('\\')) {
-                $parserState->consume('\\');
-                $parserState->consume();
-                $parserState->consumeWhiteSpace();
-            }
-        }
         $parserState->consumeWhiteSpace();
         if ($parserState->comes('!')) {
             $parserState->consume('!');

tests/ParserTest.php

@@ -1060,6 +1060,28 @@ public function unexpectedTokenExceptionLineNo(): void
         }
     }
 
+    /**
+     * @test
+     */
+    public function ieHacksCauseExceptionInStrictMode(): void
+    {
+        $this->expectException(UnexpectedTokenException::class);
+
+        self::parsedStructureForFile('ie-hacks', Settings::create()->beStrict());
+    }
+
+    /**
+     * @test
+     */
+    public function ieHacksAreRemovedInLenientMode(): void
+    {
+        $document = self::parsedStructureForFile('ie-hacks', Settings::create()->withLenientParsing(true));
+
+        $expected = 'p {padding-right: .75rem;background-image: none;color: red;'
+            . 'background-color: red;background-color: red;content: "red 	\\0";content: "red઼";}';
+        self::assertSame($expected, $document->render());
+    }
+
     /**
      * @depends files
      *

tests/fixtures/ie-hacks.css

@@ -0,0 +1,9 @@
+p {
+    padding-right: .75rem \9;
+    background-image: none \9;
+    color:red\9\0;
+    background-color:red \9 \0;
+    background-color:red \9 \0 !important;
+    content: "red \9\0";
+    content: "red\0abc";
+}