diff --git a/modules/angular2/src/compiler/html_parser.ts b/modules/angular2/src/compiler/html_parser.ts
index 40385eb105..56b522f559 100644
--- a/modules/angular2/src/compiler/html_parser.ts
+++ b/modules/angular2/src/compiler/html_parser.ts
@@ -11,7 +11,15 @@ import {
 
 import {ListWrapper} from 'angular2/src/facade/collection';
 
-import {HtmlAst, HtmlAttrAst, HtmlTextAst, HtmlCommentAst, HtmlElementAst} from './html_ast';
+import {
+  HtmlAst,
+  HtmlAttrAst,
+  HtmlTextAst,
+  HtmlCommentAst,
+  HtmlElementAst,
+  HtmlExpansionAst,
+  HtmlExpansionCaseAst
+} from './html_ast';
 
 import {Injectable} from 'angular2/src/core/di';
 import {HtmlToken, HtmlTokenType, tokenizeHtml} from './html_lexer';
@@ -32,8 +40,9 @@ export class HtmlParseTreeResult {
 
 @Injectable()
 export class HtmlParser {
-  parse(sourceContent: string, sourceUrl: string): HtmlParseTreeResult {
-    var tokensAndErrors = tokenizeHtml(sourceContent, sourceUrl);
+  parse(sourceContent: string, sourceUrl: string,
+        parseExpansionForms: boolean = false): HtmlParseTreeResult {
+    var tokensAndErrors = tokenizeHtml(sourceContent, sourceUrl, parseExpansionForms);
     var treeAndErrors = new TreeBuilder(tokensAndErrors.tokens).build();
     return new HtmlParseTreeResult(treeAndErrors.rootNodes, (<ParseError[]>tokensAndErrors.errors)
                                                                 .concat(treeAndErrors.errors));
@@ -68,6 +77,8 @@ class TreeBuilder {
                  this.peek.type === HtmlTokenType.ESCAPABLE_RAW_TEXT) {
         this._closeVoidElement();
         this._consumeText(this._advance());
+      } else if (this.peek.type === HtmlTokenType.EXPANSION_FORM_START) {
+        this._consumeExpansion(this._advance());
       } else {
         // Skip all other tokens...
         this._advance();
@@ -105,6 +116,63 @@ class TreeBuilder {
     this._addToParent(new HtmlCommentAst(value, token.sourceSpan));
   }
 
+  private _consumeExpansion(token: HtmlToken) {
+    let switchValue = this._advance();
+
+    let type = this._advance();
+    let cases = [];
+
+    // read =
+    while (this.peek.type === HtmlTokenType.EXPANSION_CASE_VALUE) {
+      let value = this._advance();
+
+      // read {
+      let exp = [];
+      if (this.peek.type !== HtmlTokenType.EXPANSION_CASE_EXP_START) {
+        this.errors.push(HtmlTreeError.create(null, this.peek.sourceSpan,
+                                              `Invalid expansion form. Missing '{'.,`));
+        return;
+      }
+
+      // read until }
+      let start = this._advance();
+      while (this.peek.type !== HtmlTokenType.EXPANSION_CASE_EXP_END) {
+        exp.push(this._advance());
+        if (this.peek.type === HtmlTokenType.EOF) {
+          this.errors.push(
+              HtmlTreeError.create(null, start.sourceSpan, `Invalid expansion form. Missing '}'.`));
+          return;
+        }
+      }
+      let end = this._advance();
+      exp.push(new HtmlToken(HtmlTokenType.EOF, [], end.sourceSpan));
+
+      // parse everything in between { and }
+      let parsedExp = new TreeBuilder(exp).build();
+      if (parsedExp.errors.length > 0) {
+        this.errors = this.errors.concat(parsedExp.errors);
+        return;
+      }
+
+      let sourceSpan = new ParseSourceSpan(value.sourceSpan.start, end.sourceSpan.end);
+      let expSourceSpan = new ParseSourceSpan(start.sourceSpan.start, end.sourceSpan.end);
+      cases.push(new HtmlExpansionCaseAst(value.parts[0], parsedExp.rootNodes, sourceSpan,
+                                          value.sourceSpan, expSourceSpan));
+    }
+
+    // read the final }
+    if (this.peek.type !== HtmlTokenType.EXPANSION_FORM_END) {
+      this.errors.push(
+          HtmlTreeError.create(null, this.peek.sourceSpan, `Invalid expansion form. Missing '}'.`));
+      return;
+    }
+    this._advance();
+
+    let mainSourceSpan = new ParseSourceSpan(token.sourceSpan.start, this.peek.sourceSpan.end);
+    this._addToParent(new HtmlExpansionAst(switchValue.parts[0], type.parts[0], cases,
+                                           mainSourceSpan, switchValue.sourceSpan));
+  }
+
   private _consumeText(token: HtmlToken) {
     let text = token.parts[0];
     if (text.length > 0 && text[0] == '\n') {
diff --git a/modules/angular2/test/compiler/html_parser_spec.ts b/modules/angular2/test/compiler/html_parser_spec.ts
index 3af628f315..403deb3d4f 100644
--- a/modules/angular2/test/compiler/html_parser_spec.ts
+++ b/modules/angular2/test/compiler/html_parser_spec.ts
@@ -18,7 +18,9 @@ import {
   HtmlAttrAst,
   HtmlTextAst,
   HtmlCommentAst,
-  htmlVisitAll
+  htmlVisitAll,
+  HtmlExpansionAst,
+  HtmlExpansionCaseAst
 } from 'angular2/src/compiler/html_ast';
 import {ParseError, ParseLocation} from 'angular2/src/compiler/parse_util';
 import {humanizeDom, humanizeDomSourceSpans, humanizeLineColumn} from './html_ast_spec_utils';
@@ -227,7 +229,7 @@ export function main() {
               .toEqual([[HtmlElementAst, 'template', 0], [HtmlAttrAst, 'k', 'v']]);
         });
 
-        it('should support mamespace', () => {
+        it('should support namespace', () => {
           expect(humanizeDom(parser.parse('<svg:use xlink:href="Port" />', 'TestComp')))
               .toEqual([[HtmlElementAst, '@svg:use', 0], [HtmlAttrAst, '@xlink:href', 'Port']]);
         });
@@ -240,6 +242,54 @@ export function main() {
         });
       });
 
+      describe("expansion forms", () => {
+        it("should parse out expansion forms", () => {
+          let parsed = parser.parse(`<div>before{messages.length, plural, =0 {You have <b>no</b> messages} =1 {One {{message}}}}after</div>`,
+                                    'TestComp', true);
+
+          expect(humanizeDom(parsed))
+              .toEqual([
+                [HtmlElementAst, 'div', 0],
+                [HtmlTextAst, 'before', 1],
+                [HtmlExpansionAst, 'messages.length', 'plural'],
+                [HtmlExpansionCaseAst, '0'],
+                [HtmlExpansionCaseAst, '1'],
+                [HtmlTextAst, 'after', 1]
+              ]);
+
+          let cases = (<any>parsed.rootNodes[0]).children[1].cases;
+
+          expect(humanizeDom(new HtmlParseTreeResult(cases[0].expression, [])))
+              .toEqual([
+                [HtmlTextAst, 'You have ', 0],
+                [HtmlElementAst, 'b', 0],
+                [HtmlTextAst, 'no', 1],
+                [HtmlTextAst, ' messages', 0],
+              ]);
+
+          expect(humanizeDom(new HtmlParseTreeResult(cases[1].expression, [])))
+              .toEqual([[HtmlTextAst, 'One {{message}}', 0]]);
+        });
+
+        it("should error when expansion form is not closed", () => {
+          let p = parser.parse(`{messages.length, plural, =0 {one}`, 'TestComp', true);
+          expect(humanizeErrors(p.errors))
+              .toEqual([[null, "Invalid expansion form. Missing '}'.", '0:34']]);
+        });
+
+        it("should error when expansion case is not closed", () => {
+          let p = parser.parse(`{messages.length, plural, =0 {one`, 'TestComp', true);
+          expect(humanizeErrors(p.errors))
+              .toEqual([[null, "Invalid expansion form. Missing '}'.", '0:29']]);
+        });
+
+        it("should error when invalid html in the case", () => {
+          let p = parser.parse(`{messages.length, plural, =0 {<b/>}`, 'TestComp', true);
+          expect(humanizeErrors(p.errors))
+              .toEqual([['b', 'Only void and foreign elements can be self closed "b"', '0:30']]);
+        });
+      });
+
       describe('source spans', () => {
         it('should store the location', () => {
           expect(humanizeDomSourceSpans(parser.parse(