elements need a DOCTYPE declaration

[zoechi]

warning: now that main takes arguments, you need to explicitly pass options to deploy(). Running as if no options were passed.
[Warning InlineCodeExtractor on polymer_elements|web/src/polymer_ajax/app_element.html] web/src/polymer_ajax/app_element.html:9:1: Unexpected start tag (link). Expected DOCTYPE.
<link rel="import" href="packages/polymer_elements/polymer_ajax/polymer_ajax.html">
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Done! All files written to "out"
Running dart2js

Done

• [x] web/src/polymer_ajax/app_element.html
• [x] web/src/polymer_selection/app_element.html
• [x] web/src/polymer_selector/app_element.html