my_template.html

<!-- the original SPARK template -->

<!-- notice the SINGLE QUOTES on the data-form attribute -->
<div data-form='{"method":"get", "action":"search"}'>
  <input type="search" name="q" placeholder="search..." />
  <input type="submit" value="go!" />
</div>


<!-- the generated html -->

<!-- notice the single quotes are now double quotes on the data-form attribute 
       this breaks the markup, completely! why not just leave the single quotes as they were? -->
<div data-form="{"method":"get", "action":"search"}">
  <input type="search" name="q" placeholder="search..." />
  <input type="submit" value="go!" />
</div>