diff --git a/docs/config/02-files.md b/docs/config/02-files.md
index 7cd632082..91de57174 100644
--- a/docs/config/02-files.md
+++ b/docs/config/02-files.md
@@ -34,6 +34,10 @@ Each pattern is either a simple string or an object with the following propertie
   * `js`
   * `dart`
   * `module`
+  * `dom`
+* **Description.** The type determines the mechanism for including the file. The `css` and `html` types
+create `link` elements; the `js`, `dart`, and `module` elements create `script` elements. The `dom` type
+includes the file content in the page, used, for example, to test components combinging HTML and JS.
 
 ### `watched`
 * **Type.** Boolean
@@ -46,17 +50,17 @@ Each pattern is either a simple string or an object with the following propertie
 * **Description.** Should the files be included in the browser using
     `<script>` tag? Use `false` if you want to load them manually, eg.
     using [Require.js](../plus/requirejs.html).
-    
+
     If a file is covered by multiple patterns with different `include` properties, the most specific pattern takes
     precedence over the other.
-    
-    The specificity of the pattern is defined as a six-tuple, where larger tuple implies lesser specificity: 
+
+    The specificity of the pattern is defined as a six-tuple, where larger tuple implies lesser specificity:
     *(n<sub>glob parts</sub>, n<sub>glob star</sub>, n<sub>star</sub>, n<sub>ext glob</sub>, n<sub>range</sub>, n<sub>optional</sub>)*.
-    Tuples are compared lexicographically. 
-    
-    The *n<sub>glob parts</sub>* is the number of patterns after the bracket sections are expanded. E.g. the 
+    Tuples are compared lexicographically.
+
+    The *n<sub>glob parts</sub>* is the number of patterns after the bracket sections are expanded. E.g. the
     the pattern *{0...9}* will yield *n<sub>glob parts</sub>=10*. The rest of the tuple is decided as the least
-    specific of each expanded pattern. 
+    specific of each expanded pattern.
 
 ### `served`
 * **Type.** Boolean
diff --git a/lib/middleware/karma.js b/lib/middleware/karma.js
index f00fa9014..b527156fe 100644
--- a/lib/middleware/karma.js
+++ b/lib/middleware/karma.js
@@ -30,7 +30,8 @@ const FILE_TYPES = [
   'html',
   'js',
   'dart',
-  'module'
+  'module',
+  'dom'
 ]
 
 function filePathToUrlPath (filePath, basePath, urlRoot, proxyPath) {
@@ -64,6 +65,7 @@ function createKarmaMiddleware (
   filesPromise,
   serveStaticFile,
   serveFile,
+  readFilePromise,
   injector,
   basePath,
   urlRoot,
@@ -133,8 +135,21 @@ function createKarmaMiddleware (
     const isRequestingContextFile = requestUrl === '/context.html'
     const isRequestingDebugFile = requestUrl === '/debug.html'
     const isRequestingClientContextFile = requestUrl === '/client_with_context.html'
+    const includedContent = new Map() // file.path -> content
     if (isRequestingContextFile || isRequestingDebugFile || isRequestingClientContextFile) {
-      return filesPromise.then(function (files) {
+      return filesPromise.then((files) => {
+        // Read any files.included that will be directly written into HTML before HTML is read.
+        const contentReads = []
+        for (const file of files.included) {
+          const fileType = file.type || path.extname(file.path).substring(1)
+          if (fileType === 'dom') {
+            contentReads.push(
+              readFilePromise(file.path).then((content) => includedContent.set(file.path, content))
+            )
+          }
+        }
+        return Promise.all(contentReads).then(() => files)
+      }).then(function (files) {
         let fileServer
         let requestedFileUrl
         log.debug('custom files', customContextFile, customDebugFile, customClientContextFile)
@@ -181,6 +196,8 @@ function createKarmaMiddleware (
 
             if (fileType === 'css') {
               scriptTags.push(`<link type="text/css" href="${filePath}" rel="stylesheet">`)
+            } else if (fileType === 'dom') {
+              scriptTags.push(includedContent.get(file.path))
             } else if (fileType === 'html') {
               scriptTags.push(`<link href="${filePath}" rel="import">`)
             } else {
@@ -224,6 +241,7 @@ createKarmaMiddleware.$inject = [
   'filesPromise',
   'serveStaticFile',
   'serveFile',
+  'readFilePromise',
   'injector',
   'config.basePath',
   'config.urlRoot',
diff --git a/lib/server.js b/lib/server.js
index dacfdc095..72466064c 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -21,6 +21,7 @@ const plugin = require('./plugin')
 const createServeFile = require('./web-server').createServeFile
 const createServeStaticFile = require('./web-server').createServeStaticFile
 const createFilesPromise = require('./web-server').createFilesPromise
+const createReadFilePromise = require('./web-server').createReadFilePromise
 const createWebServer = require('./web-server').createWebServer
 const preprocessor = require('./preprocessor')
 const Launcher = require('./launcher').Launcher
@@ -78,6 +79,7 @@ class Server extends KarmaEventEmitter {
       serveFile: ['factory', createServeFile],
       serveStaticFile: ['factory', createServeStaticFile],
       filesPromise: ['factory', createFilesPromise],
+      readFilePromise: ['factory', createReadFilePromise],
       socketServer: ['factory', createSocketIoServer],
       executor: ['factory', Executor.factory],
       // TODO(vojta): remove
diff --git a/lib/web-server.js b/lib/web-server.js
index 3bda89827..bb57289d5 100644
--- a/lib/web-server.js
+++ b/lib/web-server.js
@@ -38,7 +38,25 @@ function createFilesPromise (emitter, fileList) {
 
   return filesPromise
 }
-createFilesPromise.$inject = ['emitter', 'fileList']
+
+// Bind the filesystem into the injectable file reader function
+function createReadFilePromise () {
+  return (filepath) => {
+    return new Promise((resolve, reject) => {
+      fs.readFile(filepath, 'utf8', function (error, data) {
+        if (error) {
+          reject(new Error(`Cannot read ${filepath}, got: ${error}`))
+        } else if (!data) {
+          reject(new Error(`No content at ${filepath}`))
+        } else {
+          resolve(data.split('\n'))
+        }
+      })
+    })
+  }
+}
+
+createReadFilePromise.$inject = []
 
 function createServeStaticFile (config) {
   return common.createServeFile(fs, path.normalize(path.join(__dirname, '/../static')), config)
@@ -106,5 +124,6 @@ module.exports = {
   createWebServer,
   createServeFile,
   createServeStaticFile,
-  createFilesPromise
+  createFilesPromise,
+  createReadFilePromise
 }
diff --git a/test/unit/middleware/karma.spec.js b/test/unit/middleware/karma.spec.js
index 6440511e0..18a8ec953 100644
--- a/test/unit/middleware/karma.spec.js
+++ b/test/unit/middleware/karma.spec.js
@@ -12,6 +12,7 @@ const HttpRequestMock = mocks.http.ServerRequest
 
 describe('middleware.karma', () => {
   let serveFile
+  let readFilesDeferred
   let filesDeferred
   let nextSpy
   let response
@@ -63,6 +64,7 @@ describe('middleware.karma', () => {
       filesDeferred.promise,
       serveFile,
       null,
+      null,
       injector,
       '/base/path',
       '/__karma__/',
@@ -119,10 +121,12 @@ describe('middleware.karma', () => {
   })
 
   it('should serve client.html', (done) => {
+    readFilesDeferred = helper.defer()
     handler = createKarmaMiddleware(
       null,
       serveFile,
       null,
+      readFilesDeferred.promise,
       injector,
       '/base',
       '/'
@@ -138,10 +142,12 @@ describe('middleware.karma', () => {
   })
 
   it('should serve /?id=xxx', (done) => {
+    readFilesDeferred = helper.defer()
     handler = createKarmaMiddleware(
       null,
       serveFile,
       null,
+      readFilesDeferred.promise,
       injector,
       '/base',
       '/'
@@ -157,10 +163,13 @@ describe('middleware.karma', () => {
   })
 
   it('should serve /?x-ua-compatible with replaced values', (done) => {
+    readFilesDeferred = helper.defer()
+
     handler = createKarmaMiddleware(
       null,
       serveFile,
       null,
+      readFilesDeferred.promise,
       injector,
       '/base',
       '/'
@@ -268,6 +277,43 @@ describe('middleware.karma', () => {
     callHandlerWith('/__karma__/context.html')
   })
 
+  it('should serve context.html with included DOM content', (done) => {
+    const readFilePromise = (path) => {
+      const cases = {
+        '/some/abc/a.dom': 'a',
+        '/some/abc/b_test_dom.html': 'b',
+        '/some/abc/c': 'c',
+        '/some/abc/d_test_dom.html': 'd'
+      }
+      return Promise.resolve(cases[path] || '?unknown ' + path)
+    }
+
+    filesDeferred = helper.defer()
+    handler = createKarmaMiddleware(
+      filesDeferred.promise,
+      serveFile,
+      null,
+      readFilePromise,
+      injector,
+      '/base',
+      '/'
+    )
+
+    includedFiles([
+      new MockFile('/some/abc/a.dom', 'sha1'),
+      new MockFile('/some/abc/b_test_dom.html', 'sha2', 'dom'),
+      new MockFile('/some/abc/c', 'sha3', 'dom')
+    ])
+
+    response.once('end', () => {
+      expect(nextSpy).not.to.have.been.called
+      expect(response).to.beServedAs(200, 'CONTEXT\na\nb\nc')
+      done()
+    })
+
+    callHandlerWith('/context.html')
+  })
+
   it('should serve context.json with the correct paths for all files', (done) => {
     includedFiles([
       new MockFile('/some/abc/a.css', 'sha1'),
@@ -422,10 +468,12 @@ describe('middleware.karma', () => {
 
   it('should update handle updated configs', (done) => {
     let i = 0
+    readFilesDeferred = helper.defer()
     handler = createKarmaMiddleware(
       filesDeferred.promise,
       serveFile,
       null,
+      readFilesDeferred.promise,
       {
         get (val) {
           if (val === 'config.client') {
diff --git a/test/unit/web-server.spec.js b/test/unit/web-server.spec.js
index 0959748b7..fdae27d37 100644
--- a/test/unit/web-server.spec.js
+++ b/test/unit/web-server.spec.js
@@ -63,6 +63,7 @@ describe('web-server', () => {
         filesPromise: ['factory', m.createFilesPromise],
         serveStaticFile: ['factory', m.createServeStaticFile],
         serveFile: ['factory', m.createServeFile],
+        readFilePromise: ['factory', m.createReadFilePromise],
         capturedBrowsers: ['value', null],
         reporter: ['value', null],
         executor: ['value', null],
@@ -232,7 +233,7 @@ describe('web-server', () => {
         filesPromise: ['factory', m.createFilesPromise],
         serveStaticFile: ['factory', m.createServeStaticFile],
         serveFile: ['factory', m.createServeFile],
-
+        readFilePromise: ['factory', m.createReadFilePromise],
         capturedBrowsers: ['value', null],
         reporter: ['value', null],
         executor: ['value', null],
@@ -277,6 +278,7 @@ describe('web-server', () => {
         filesPromise: ['factory', m.createFilesPromise],
         serveStaticFile: ['factory', m.createServeStaticFile],
         serveFile: ['factory', m.createServeFile],
+        readFilePromise: ['factory', m.createReadFilePromise],
         capturedBrowsers: ['value', null],
         reporter: ['value', null],
         executor: ['value', null],