Fix spelling mistakes in comments.

components/style/media_queries.rs

@@ -262,7 +262,7 @@ pub fn parse_media_query_list(input: &[ComponentValue]) -> MediaQueryList {
             }
 
             // Add the media query if it was valid and no trailing tokens were found.
-            // Otherwse, create a 'not all' media query, that will never match.
+            // Otherwise, create a 'not all' media query, that will never match.
             let media_query = match (media_query_result, trailing_tokens) {
                 (Ok(media_query), false) => media_query,
                 _ => MediaQuery::new(Some(Not), All, vec!()),

components/style/selector_matching.rs

@@ -663,7 +663,7 @@ fn matches_compound_selector<'a,E,N>(selector: &CompoundSelector,
 /// candidates for "d1" becomes less than before and d1 .
 ///
 /// The next example is siblings. When the selector "b1 + b2 ~ d1 a" is
-/// providied and we cannot *find* an appropriate brother node for b1,
+/// provided and we cannot *find* an appropriate brother node for b1,
 /// the selector matching raises NotMatchedAndRestartFromClosestDescendant.
 /// The selectors ("b1 + b2 ~") doesn't match and matching restart from "d1".
 ///

components/style/stylesheets.rs

@@ -46,7 +46,7 @@ impl Stylesheet {
             mut input: I, base_url: Url, protocol_encoding_label: Option<&str>,
             environment_encoding: Option<EncodingRef>, origin: StylesheetOrigin) -> Stylesheet {
         let mut bytes = vec!();
-        // TODO: incremental decoding and tokinization/parsing
+        // TODO: incremental decoding and tokenization/parsing
         for chunk in input {
             bytes.push_all(chunk.as_slice())
         }