Automatically resize the webtry text editor to fit the content

experimental/webtry/templates/content.html

 
 <section id=content>
 
   <template id=sourcesTemplate>
       <button id="" class=source><img width=64 height=64 src=''></button>
   </template>
   <input type="checkbox" id="enableSource" data-id="{{.Source}}"> Use an input bitmap.
   <br>
-  <button id=selectedSource></button>
-  <pre id=sourceCode>SkBitmap source;</pre>
-  <div id=chooseSource>
+  <button id="selectedSource"></button>
+  <pre id="sourceCode">SkBitmap source;</pre>
+  <div id="chooseSource">
     Choose an image below or upload a new one to use as an input bitmap.
     <div id="chooseList">
     </div>
     <form action="/sources/" method="post" accept-charset="utf-8" enctype="multipart/form-data">
       <input type="file" accept="image/*" name="upload" value="" id="upload">
       <input type="submit" value="Add Image">
     </form>
   </div>
 
   <pre>
@@ skipping 11 matching lines @@
   <img  touch-action='none' class='zoom' id='img' src='{{if .Hash}}/i/{{.Hash}}.png{{end}}'/>
   </p>
   <p id='zoomHex'></p>
 
   <h2>Warnings and Errors</h2>
   <pre><code id='output'></code></pre>
   <h2>Runtime output</h2>
   <pre id='stdout'></pre>
 
 </section>