[fix] CSS insertion in Edge browser

Edge browser throws `HierarchyRequestError` while inserting CSS rules into CSS
Media Queries. Therefore, a different mechanism is required to control CSS
order. This patch tracks the starting index of each group of CSS rules in the
DOM style sheet.

Fix #1300
Close #1302

packages/react-native-web/src/exports/AppRegistry/__tests__/__snapshots__/index-test.js.snap

@@ -1,30 +1,20 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`AppRegistry getApplication "getStyleElement" produces styles that are a function of rendering "element" 1`] = `
-"@media all {
+"[stylesheet-group=\\"0\\"]{}
-[stylesheet-group=\\"0\\"]{}
 html{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:rgba(0,0,0,0);}
 body{margin:0;}
 button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0;}
 input::-webkit-inner-spin-button,input::-webkit-outer-spin-button,input::-webkit-search-cancel-button,input::-webkit-search-decoration,input::-webkit-search-results-button,input::-webkit-search-results-decoration{display:none;}
-}
-@media all {
 [stylesheet-group=\\"0.1\\"]{}
 :focus:not([data-focusvisible-polyfill]){outline: none;}
-}
-@media all {
 [stylesheet-group=\\"1\\"]{}
 .css-view-1dbjc4n{-ms-flex-align:stretch;-ms-flex-direction:column;-ms-flex-negative:0;-ms-flex-preferred-size:auto;-webkit-align-items:stretch;-webkit-box-align:stretch;-webkit-box-direction:normal;-webkit-box-orient:vertical;-webkit-flex-basis:auto;-webkit-flex-direction:column;-webkit-flex-shrink:0;align-items:stretch;border:0 solid black;box-sizing:border-box;display:-webkit-box;display:-moz-box;display:-ms-flexbox;display:-webkit-flex;display:flex;flex-basis:auto;flex-direction:column;flex-shrink:0;margin-bottom:0px;margin-left:0px;margin-right:0px;margin-top:0px;min-height:0px;min-width:0px;padding-bottom:0px;padding-left:0px;padding-right:0px;padding-top:0px;position:relative;z-index:0;}
-}
-@media all {
 [stylesheet-group=\\"2\\"]{}
 .r-flex-13awgt0{-ms-flex-negative:1;-ms-flex-positive:1;-ms-flex-preferred-size:0%;-webkit-box-flex:1;-webkit-flex-basis:0%;-webkit-flex-grow:1;-webkit-flex-shrink:1;flex-basis:0%;flex-grow:1;flex-shrink:1;}
-}
-@media all {
 [stylesheet-group=\\"2.2\\"]{}
 .r-pointerEvents-12vffkv>*{pointer-events:auto;}
-.r-pointerEvents-12vffkv{pointer-events:none!important;}
+.r-pointerEvents-12vffkv{pointer-events:none!important;}"
-}"
 `;
 
 exports[`AppRegistry getApplication returns "element" and "getStyleElement" 1`] = `
@@ -36,15 +26,11 @@ exports[`AppRegistry getApplication returns "element" and "getStyleElement" 1`]
 `;
 
 exports[`AppRegistry getApplication returns "element" and "getStyleElement" 2`] = `
-"<style id=\\"react-native-stylesheet\\">@media all {
+"<style id=\\"react-native-stylesheet\\">[stylesheet-group=\\"0\\"]{}
-[stylesheet-group=\\"0\\"]{}
 html{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;-webkit-tap-highlight-color:rgba(0,0,0,0);}
 body{margin:0;}
 button::-moz-focus-inner,input::-moz-focus-inner{border:0;padding:0;}
 input::-webkit-inner-spin-button,input::-webkit-outer-spin-button,input::-webkit-search-cancel-button,input::-webkit-search-decoration,input::-webkit-search-results-button,input::-webkit-search-results-decoration{display:none;}
-}
-@media all {
 [stylesheet-group=\\"0.1\\"]{}
-:focus:not([data-focusvisible-polyfill]){outline: none;}
+:focus:not([data-focusvisible-polyfill]){outline: none;}</style>"
-}</style>"
 `;

packages/react-native-web/src/exports/StyleSheet/__tests__/__snapshots__/createOrderedCSSStyleSheet-test.js.snap

@@ -3,81 +3,57 @@
 exports[`createOrderedCSSStyleSheet #insert deduplication for same group 1`] = `""`;
 
 exports[`createOrderedCSSStyleSheet #insert deduplication for same group 2`] = `
-"@media all {
+"[stylesheet-group=\\"0\\"]{}
-[stylesheet-group=\\"0\\"]{}
+.one {}"
-.one {}
-}"
 `;
 
 exports[`createOrderedCSSStyleSheet #insert deduplication for same group 3`] = `
-"@media all {
+"[stylesheet-group=\\"0\\"]{}
-[stylesheet-group=\\"0\\"]{}
+.one {}"
-.one {}
-}"
 `;
 
 exports[`createOrderedCSSStyleSheet #insert insertion order for different groups 1`] = `
-"@media all {
+"[stylesheet-group=\\"1\\"]{}
-[stylesheet-group=\\"1\\"]{}
 .one {}
-}
-@media all {
 [stylesheet-group=\\"2.2\\"]{}
 .two {}
-}
-@media all {
 [stylesheet-group=\\"3\\"]{}
 .three {}
-}
-@media all {
 [stylesheet-group=\\"4\\"]{}
 .four-1 {}
 .four-2 {}
-}
-@media all {
 [stylesheet-group=\\"9.9\\"]{}
 .nine-1 {}
-.nine-2 {}
+.nine-2 {}"
-}"
 `;
 
 exports[`createOrderedCSSStyleSheet #insert insertion order for same group 1`] = `""`;
 
 exports[`createOrderedCSSStyleSheet #insert insertion order for same group 2`] = `
-"@media all {
+"[stylesheet-group=\\"0\\"]{}
-[stylesheet-group=\\"0\\"]{}
+.one {}"
-.one {}
-}"
 `;
 
 exports[`createOrderedCSSStyleSheet #insert insertion order for same group 3`] = `
-"@media all {
+"[stylesheet-group=\\"0\\"]{}
-[stylesheet-group=\\"0\\"]{}
 .one {}
-.two {}
+.two {}"
-}"
 `;
 
 exports[`createOrderedCSSStyleSheet #insert insertion order for same group 4`] = `
-"@media all {
+"[stylesheet-group=\\"0\\"]{}
-[stylesheet-group=\\"0\\"]{}
 .one {}
 .two {}
-.three {}
+.three {}"
-}"
 `;
 
 exports[`createOrderedCSSStyleSheet client-side hydration from SSR CSS 1`] = `
-"@media all {
+"[stylesheet-group=\\"1\\"] {}
-[stylesheet-group=\\"1\\"] {}
 .one {width: 10px;}
-}
-@media all {
 [stylesheet-group=\\"2\\"] {}
 .two-1 {height: 20px;}
 .two-2 {color: red;}
 @keyframes anim { 
   0% {opacity: 1;} 
-}
 }"
 `;

packages/react-native-web/src/exports/StyleSheet/createOrderedCSSStyleSheet.js

@@ -7,7 +7,7 @@
  * @flow strict-local
  */
 
-type Groups = { [key: number]: Array<string> };
+type Groups = { [key: number]: { start: ?number, rules: Array<string> } };
 type Selectors = { [key: string]: boolean };
 
 const slice = Array.prototype.slice;
@@ -15,17 +15,17 @@ const slice = Array.prototype.slice;
 /**
  * Order-based insertion of CSS.
  *
- * Each rule can be inserted (appended) into a numerically defined group.
+ * Each rule is associated with a numerically defined group.
  * Groups are ordered within the style sheet according to their number, with the
  * lowest first.
  *
- * Groups are implemented using Media Query blocks. CSSMediaRule implements the
+ * Groups are implemented using marker rules. The selector of the first rule of
- * CSSGroupingRule, which includes 'insertRule', allowing groups to be treated as
+ * each group is used only to encode the group number for hydration. An
- * a sub-sheet.
+ * alternative implementation could rely on CSSMediaRule, allowing groups to be
+ * treated as a sub-sheet, but the Edge implementation of CSSMediaRule is
+ * broken.
  * https://developer.mozilla.org/en-US/docs/Web/API/CSSMediaRule
- *
+ * https://gist.github.com/necolas/aa0c37846ad6bd3b05b727b959e82674
- * The selector of the first rule of each group is used only to encode the group
- * number for hydration.
  */
 export default function createOrderedCSSStyleSheet(sheet: ?CSSStyleSheet) {
   const groups: Groups = {};
@@ -35,59 +35,78 @@ export default function createOrderedCSSStyleSheet(sheet: ?CSSStyleSheet) {
    * Hydrate approximate record from any existing rules in the sheet.
    */
   if (sheet != null) {
-    slice.call(sheet.cssRules).forEach(mediaRule => {
+    let group;
-      if (mediaRule.media == null) {
+    slice.call(sheet.cssRules).forEach((cssRule, i) => {
-        throw new Error(
+      const cssText = cssRule.cssText;
-          'OrderedCSSStyleSheet: hydrating invalid stylesheet. Expected only @media rules.'
-        );
-      }
-
-      // Create group number
-      const group = decodeGroupRule(mediaRule);
-      groups[group] = [];
-
       // Create record of existing selectors and rules
-      slice.call(mediaRule.cssRules).forEach(rule => {
+      if (cssText.indexOf('stylesheet-group') > -1) {
-        const selectorText = getSelectorText(rule.cssText);
+        group = decodeGroupRule(cssRule);
+        groups[group] = { start: i, rules: [cssText] };
+      } else {
+        const selectorText = getSelectorText(cssText);
         if (selectorText != null) {
           selectors[selectorText] = true;
-          groups[group].push(rule.cssText);
+          groups[group].rules.push(cssText);
         }
-      });
+      }
     });
   }
 
+  function sheetInsert(sheet, group, text) {
+    const orderedGroups = getOrderedGroups(groups);
+    const groupIndex = orderedGroups.indexOf(group);
+    const nextGroupIndex = groupIndex + 1;
+    const nextGroup = orderedGroups[nextGroupIndex];
+    // Insert rule before the next group, or at the end of the stylesheet
+    const position =
+      nextGroup != null && groups[nextGroup].start != null
+        ? groups[nextGroup].start
+        : sheet.cssRules.length;
+    const isInserted = insertRuleAt(sheet, text, position);
+
+    if (isInserted) {
+      // Set the starting index of the new group
+      if (groups[group].start == null) {
+        groups[group].start = position;
+      }
+      // Increment the starting index of all subsequent groups
+      for (let i = nextGroupIndex; i < orderedGroups.length; i += 1) {
+        const groupNumber = orderedGroups[i];
+        const previousStart = groups[groupNumber].start;
+        groups[groupNumber].start = previousStart + 1;
+      }
+    }
+
+    return isInserted;
+  }
+
   const OrderedCSSStyleSheet = {
     /**
      * The textContent of the style sheet.
-     * Each group's rules are wrapped in a media query.
      */
     getTextContent(): string {
       return getOrderedGroups(groups)
         .map(group => {
-          const rules = groups[group];
+          const rules = groups[group].rules;
-          const str = rules.join('\n');
+          return rules.join('\n');
-          return createMediaRule(str);
         })
         .join('\n');
     },
 
     /**
-     * Insert a rule into a media query in the style sheet
+     * Insert a rule into the style sheet
      */
-    insert(cssText: string, group: number) {
+    insert(cssText: string, groupValue: number) {
+      const group = Number(groupValue);
+
       // Create a new group.
       if (groups[group] == null) {
         const markerRule = encodeGroupRule(group);
-
         // Create the internal record.
-        groups[group] = [];
+        groups[group] = { start: null, rules: [markerRule] };
-        groups[group].push(markerRule);
+        // Update CSSOM.
-
-        // Create CSSOM CSSMediaRule.
         if (sheet != null) {
-          const groupIndex = getOrderedGroups(groups).indexOf(group);
+          sheetInsert(sheet, group, markerRule);
-          insertRuleAt(sheet, createMediaRule(markerRule), groupIndex);
         }
       }
 
@@ -98,14 +117,14 @@ export default function createOrderedCSSStyleSheet(sheet: ?CSSStyleSheet) {
       if (selectorText != null && selectors[selectorText] == null) {
         // Update the internal records.
         selectors[selectorText] = true;
-        groups[group].push(cssText);
+        groups[group].rules.push(cssText);
-        // Update CSSOM CSSMediaRule.
+        // Update CSSOM.
         if (sheet != null) {
-          const groupIndex = getOrderedGroups(groups).indexOf(group);
+          const isInserted = sheetInsert(sheet, group, cssText);
-          const root = sheet.cssRules[groupIndex];
+          if (!isInserted) {
-          if (root != null) {
+            // Revert internal record change if a rule was rejected (e.g.,
-            // $FlowFixMe: Flow is missing CSSOM types
+            // unrecognized pseudo-selector)
-            insertRuleAt(root, cssText, root.cssRules.length);
+            groups[group].rules.pop();
           }
         }
       }
@@ -119,16 +138,12 @@ export default function createOrderedCSSStyleSheet(sheet: ?CSSStyleSheet) {
  * Helper functions
  */
 
-function createMediaRule(content) {
-  return `@media all {\n${content}\n}`;
-}
-
 function encodeGroupRule(group) {
   return `[stylesheet-group="${group}"]{}`;
 }
 
-function decodeGroupRule(mediaRule) {
+function decodeGroupRule(cssRule) {
-  return mediaRule.cssRules[0].selectorText.split('"')[1];
+  return Number(cssRule.selectorText.split('"')[1]);
 }
 
 function getOrderedGroups(obj: { [key: number]: any }) {
@@ -143,12 +158,14 @@ function getSelectorText(cssText) {
   return selector !== '' ? selector.replace(pattern, '$1') : null;
 }
 
-function insertRuleAt(root, cssText: string, position: number) {
+function insertRuleAt(root, cssText: string, position: number): boolean {
   try {
     // $FlowFixMe: Flow is missing CSSOM types needed to type 'root'.
     root.insertRule(cssText, position);
+    return true;
   } catch (e) {
     // JSDOM doesn't support `CSSSMediaRule#insertRule`.
     // Also ignore errors that occur from attempting to insert vendor-prefixed selectors.
+    return false;
   }
 }