Auto merge of #16373 - jryans:at-page-viewport-units, r=emilio

Stylo: Disable viewport units for @page

Reviewed by @emilio in [bug 1353191](https://bugzilla.mozilla.org/show_bug.cgi?id=1353191).

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors

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---
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components/script/dom/css.rs

@@ -10,6 +10,7 @@ use dom::bindings::str::DOMString;
 use dom::window::Window;
 use dom_struct::dom_struct;
 use style::parser::ParserContext;
+use style::stylesheets::CssRuleType;
 use style::supports::{Declaration, parse_condition_or_declaration};
 
 #[dom_struct]
@@ -29,7 +30,7 @@ impl CSS {
     pub fn Supports(win: &Window, property: DOMString, value: DOMString) -> bool {
         let decl = Declaration { prop: property.into(), val: value.into() };
         let url = win.Document().url();
-        let context = ParserContext::new_for_cssom(&url, win.css_error_reporter());
+        let context = ParserContext::new_for_cssom(&url, win.css_error_reporter(), Some(CssRuleType::Supports));
         decl.eval(&context)
     }
 
@@ -39,7 +40,7 @@ impl CSS {
         let cond = parse_condition_or_declaration(&mut input);
         if let Ok(cond) = cond {
             let url = win.Document().url();
-            let context = ParserContext::new_for_cssom(&url, win.css_error_reporter());
+            let context = ParserContext::new_for_cssom(&url, win.css_error_reporter(), Some(CssRuleType::Supports));
             cond.eval(&context)
         } else {
             false

components/script/dom/cssmediarule.rs

@@ -16,8 +16,9 @@ use dom::window::Window;
 use dom_struct::dom_struct;
 use std::sync::Arc;
 use style::media_queries::parse_media_query_list;
+use style::parser::ParserContext;
 use style::shared_lock::{Locked, ToCssWithGuard};
-use style::stylesheets::MediaRule;
+use style::stylesheets::{CssRuleType, MediaRule};
 use style_traits::ToCss;
 
 #[dom_struct]
@@ -68,7 +69,11 @@ impl CSSMediaRule {
     /// https://drafts.csswg.org/css-conditional-3/#the-cssmediarule-interface
     pub fn set_condition_text(&self, text: DOMString) {
         let mut input = Parser::new(&text);
-        let new_medialist = parse_media_query_list(&mut input);
+        let global = self.global();
+        let win = global.as_window();
+        let url = win.get_url();
+        let context = ParserContext::new_for_cssom(&url, win.css_error_reporter(), Some(CssRuleType::Media));
+        let new_medialist = parse_media_query_list(&context, &mut input);
         let mut guard = self.cssconditionrule.shared_lock().write();
 
         // Clone an Arc because we can’t borrow `guard` twice at the same time.

components/script/dom/csssupportsrule.rs

@@ -16,7 +16,7 @@ use dom_struct::dom_struct;
 use std::sync::Arc;
 use style::parser::ParserContext;
 use style::shared_lock::{Locked, ToCssWithGuard};
-use style::stylesheets::SupportsRule;
+use style::stylesheets::{CssRuleType, SupportsRule};
 use style::supports::SupportsCondition;
 use style_traits::ToCss;
 
@@ -61,7 +61,7 @@ impl CSSSupportsRule {
             let global = self.global();
             let win = global.as_window();
             let url = win.Document().url();
-            let context = ParserContext::new_for_cssom(&url, win.css_error_reporter());
+            let context = ParserContext::new_for_cssom(&url, win.css_error_reporter(), Some(CssRuleType::Supports));
             let enabled = cond.eval(&context);
             let mut guard = self.cssconditionrule.shared_lock().write();
             let rule = self.supportsrule.write_with(&mut guard);

components/script/dom/htmllinkelement.rs

@@ -32,8 +32,9 @@ use std::default::Default;
 use std::sync::Arc;
 use style::attr::AttrValue;
 use style::media_queries::parse_media_query_list;
+use style::parser::ParserContext as CssParserContext;
 use style::str::HTML_SPACE_CHARACTERS;
-use style::stylesheets::Stylesheet;
+use style::stylesheets::{CssRuleType, Stylesheet};
 use stylesheet_loader::{StylesheetLoader, StylesheetContextSource, StylesheetOwner};
 
 unsafe_no_jsmanaged_fields!(Stylesheet);
@@ -255,7 +256,7 @@ impl HTMLLinkElement {
         }
 
         // Step 2.
-        let url = match document.base_url().join(href) {
+        let link_url = match document.base_url().join(href) {
             Ok(url) => url,
             Err(e) => {
                 debug!("Parsing url {} failed: {}", href, e);
@@ -276,7 +277,10 @@ impl HTMLLinkElement {
         };
 
         let mut css_parser = CssParser::new(&mq_str);
-        let media = parse_media_query_list(&mut css_parser);
+        let win = document.window();
+        let doc_url = document.url();
+        let context = CssParserContext::new_for_cssom(&doc_url, win.css_error_reporter(), Some(CssRuleType::Media));
+        let media = parse_media_query_list(&context, &mut css_parser);
 
         let im_attribute = element.get_attribute(&ns!(), &local_name!("integrity"));
         let integrity_val = im_attribute.r().map(|a| a.value());
@@ -292,7 +296,7 @@ impl HTMLLinkElement {
         let loader = StylesheetLoader::for_element(self.upcast());
         loader.load(StylesheetContextSource::LinkElement {
             media: Some(media),
-        }, url, cors_setting, integrity_metadata.to_owned());
+        }, link_url, cors_setting, integrity_metadata.to_owned());
     }
 
     fn handle_favicon_url(&self, rel: &str, href: &str, sizes: &Option<String>) {

components/script/dom/htmlstyleelement.rs

@@ -25,7 +25,8 @@ use script_layout_interface::message::Msg;
 use std::cell::Cell;
 use std::sync::Arc;
 use style::media_queries::parse_media_query_list;
-use style::stylesheets::{Stylesheet, Origin};
+use style::parser::ParserContext as CssParserContext;
+use style::stylesheets::{CssRuleType, Stylesheet, Origin};
 use stylesheet_loader::{StylesheetLoader, StylesheetOwner};
 
 #[dom_struct]
@@ -73,7 +74,6 @@ impl HTMLStyleElement {
         assert!(node.is_in_doc());
 
         let win = window_from_node(node);
-        let url = win.get_url();
 
         let mq_attribute = element.get_attribute(&ns!(), &local_name!("media"));
         let mq_str = match mq_attribute {
@@ -82,10 +82,14 @@ impl HTMLStyleElement {
         };
 
         let data = node.GetTextContent().expect("Element.textContent must be a string");
-        let mq = parse_media_query_list(&mut CssParser::new(&mq_str));
+        let url = win.get_url();
+        let context = CssParserContext::new_for_cssom(&url,
+                                                      win.css_error_reporter(),
+                                                      Some(CssRuleType::Media));
+        let mq = parse_media_query_list(&context, &mut CssParser::new(&mq_str));
         let shared_lock = node.owner_doc().style_shared_lock().clone();
         let loader = StylesheetLoader::for_element(self.upcast());
-        let sheet = Stylesheet::from_str(&data, url, Origin::Author, mq,
+        let sheet = Stylesheet::from_str(&data, win.get_url(), Origin::Author, mq,
                                          shared_lock, Some(&loader),
                                          win.css_error_reporter());
 

components/script/dom/medialist.rs

@@ -7,7 +7,7 @@ use cssparser::Parser;
 use dom::bindings::codegen::Bindings::MediaListBinding;
 use dom::bindings::codegen::Bindings::MediaListBinding::MediaListMethods;
 use dom::bindings::js::{JS, Root};
-use dom::bindings::reflector::{Reflector, reflect_dom_object};
+use dom::bindings::reflector::{DomObject, Reflector, reflect_dom_object};
 use dom::bindings::str::DOMString;
 use dom::cssstylesheet::CSSStyleSheet;
 use dom::window::Window;
@@ -15,7 +15,9 @@ use dom_struct::dom_struct;
 use std::sync::Arc;
 use style::media_queries::{MediaQuery, parse_media_query_list};
 use style::media_queries::MediaList as StyleMediaList;
+use style::parser::ParserContext;
 use style::shared_lock::{SharedRwLock, Locked};
+use style::stylesheets::CssRuleType;
 use style_traits::ToCss;
 
 #[dom_struct]
@@ -70,7 +72,11 @@ impl MediaListMethods for MediaList {
         }
         // Step 3
         let mut parser = Parser::new(&value);
-        *media_queries = parse_media_query_list(&mut parser);
+        let global = self.global();
+        let win = global.as_window();
+        let url = win.get_url();
+        let context = ParserContext::new_for_cssom(&url, win.css_error_reporter(), Some(CssRuleType::Media));
+        *media_queries = parse_media_query_list(&context, &mut parser);
     }
 
     // https://drafts.csswg.org/cssom/#dom-medialist-length
@@ -99,7 +105,11 @@ impl MediaListMethods for MediaList {
     fn AppendMedium(&self, medium: DOMString) {
         // Step 1
         let mut parser = Parser::new(&medium);
-        let m = MediaQuery::parse(&mut parser);
+        let global = self.global();
+        let win = global.as_window();
+        let url = win.get_url();
+        let context = ParserContext::new_for_cssom(&url, win.css_error_reporter(), Some(CssRuleType::Media));
+        let m = MediaQuery::parse(&context, &mut parser);
         // Step 2
         if let Err(_) = m {
             return;
@@ -120,7 +130,11 @@ impl MediaListMethods for MediaList {
     fn DeleteMedium(&self, medium: DOMString) {
         // Step 1
         let mut parser = Parser::new(&medium);
-        let m = MediaQuery::parse(&mut parser);
+        let global = self.global();
+        let win = global.as_window();
+        let url = win.get_url();
+        let context = ParserContext::new_for_cssom(&url, win.css_error_reporter(), Some(CssRuleType::Media));
+        let m = MediaQuery::parse(&context, &mut parser);
         // Step 2
         if let Err(_) = m {
             return;

components/script/dom/window.rs

@@ -103,10 +103,12 @@ use std::sync::mpsc::TryRecvError::{Disconnected, Empty};
 use style::context::ReflowGoal;
 use style::error_reporting::ParseErrorReporter;
 use style::media_queries;
+use style::parser::ParserContext as CssParserContext;
 use style::properties::PropertyId;
 use style::properties::longhands::overflow_x;
 use style::selector_parser::PseudoElement;
 use style::str::HTML_SPACE_CHARACTERS;
+use style::stylesheets::CssRuleType;
 use task_source::dom_manipulation::DOMManipulationTaskSource;
 use task_source::file_reading::FileReadingTaskSource;
 use task_source::history_traversal::HistoryTraversalTaskSource;
@@ -963,7 +965,9 @@ impl WindowMethods for Window {
     // https://drafts.csswg.org/cssom-view/#dom-window-matchmedia
     fn MatchMedia(&self, query: DOMString) -> Root<MediaQueryList> {
         let mut parser = Parser::new(&query);
-        let media_query_list = media_queries::parse_media_query_list(&mut parser);
+        let url = self.get_url();
+        let context = CssParserContext::new_for_cssom(&url, self.css_error_reporter(), Some(CssRuleType::Media));
+        let media_query_list = media_queries::parse_media_query_list(&context, &mut parser);
         let document = self.Document();
         let mql = MediaQueryList::new(&document, media_query_list);
         self.media_query_lists.push(&*mql);