Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
How to Train Your Dragon (franchise)
Table title:
Cast and characters
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=3 > Characters </th><th colspan=3 rowspan=1 > Theatrical films </th><th colspan=4 rowspan=1 > Short films </th><th colspan=1 rowspan=1 > Television series </th></tr>
<tr> <th colspan=1 rowspan=1 > How to Train Your Dragon </th><th colspan=1 rowspan=1 > How to Train Your Dragon 2 </th><th colspan=1 rowspan=1 > How to Train Your Dragon: The Hidden World </th><th class="highlighted"  colspan=1 rowspan=1 > Legend of the Boneknapper Dragon </th><th class="highlighted"  colspan=1 rowspan=1 > Gift of the Night Fury </th><th class="highlighted"  colspan=1 rowspan=1 > Book of Dragons </th><th class="highlighted"  colspan=1 rowspan=1 > Dawn of the Dragon Racers </th><th colspan=1 rowspan=1 > DreamWorks Dragons </th></tr>
<tr> <th colspan=1 rowspan=1 > 2010 </th><th colspan=1 rowspan=1 > 2014 </th><th colspan=1 rowspan=1 > 2019 </th><th colspan=1 rowspan=1 > 2010 </th><th class="highlighted"  colspan=2 rowspan=1 > 2011 </th><th class="highlighted"  colspan=1 rowspan=1 > 2014 </th><th colspan=1 rowspan=1 > 2012–2018 </th></tr>
<tr> <th colspan=1 rowspan=1 > Hiccup Horrendous Hadock III </th><td colspan=2 rowspan=1 > Jay Baruchel </td><td colspan=1 rowspan=1 > Jay BaruchelA. J. Kane (young) </td><td colspan=5 rowspan=1 > Jay Baruchel </td></tr>
<tr> <th colspan=1 rowspan=1 > Stoick the Vast </th><td colspan=5 rowspan=1 > Gerard Butler </td><td colspan=1 rowspan=1 >  </td><td colspan=2 rowspan=1 > Nolan North </td></tr>
<tr> <th colspan=1 rowspan=1 > Gobber the Belch </th><td colspan=6 rowspan=1 > Craig Ferguson </td><td colspan=2 rowspan=1 > Chris Edgerly </td></tr>
<tr> <th colspan=1 rowspan=1 > Astrid Hofferson </th><td colspan=8 rowspan=1 > America Ferrera </td></tr>
<tr> <th colspan=1 rowspan=1 > Snotlout Jorgensen </th><td colspan=5 rowspan=1 > Jonah Hill </td><td colspan=1 rowspan=1 >  </td><td colspan=2 rowspan=1 > Zack Pearlman </td></tr>
<tr> <th colspan=1 rowspan=1 > Fishlegs Ingerman </th><td colspan=8 rowspan=1 > Christopher Mintz-Plasse </td></tr>
<tr> <th colspan=1 rowspan=1 > Tuffnut Thorston </th><td colspan=2 rowspan=1 > T. J. Miller </td><td colspan=1 rowspan=1 > Justin Rupple </td><td colspan=2 rowspan=1 > T. J. Miller </td><td colspan=1 rowspan=1 >  </td><td colspan=2 rowspan=1 > T. J. Miller </td></tr>
<tr> <th colspan=1 rowspan=1 > Ruffnut Thorston </th><td colspan=5 rowspan=1 > Kristen Wiig </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Andree Vermeulen </td><td colspan=1 rowspan=1 > Julie MarcusAndrée Vermeulen </td></tr>
<tr> <th colspan=1 rowspan=1 > Spitelout </th><td colspan=1 rowspan=1 > David Tennant </td><td colspan=1 rowspan=1 > David Tennant (uncredited) </td><td colspan=1 rowspan=1 > David Tennant </td><td colspan=4 rowspan=1 >  </td><td colspan=1 rowspan=1 > David Tennant </td></tr>
<tr> <th colspan=1 rowspan=1 > Valka </th><td colspan=1 rowspan=1 >  </td><td colspan=2 rowspan=1 > Cate Blanchett </td><td colspan=4 rowspan=1 >  </td><td colspan=1 rowspan=1 > Silent role </td></tr>
<tr> <th colspan=1 rowspan=1 > Drago Bludvist </th><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > Djimon Hounsou </td><td colspan=1 rowspan=1 > Deleted scene </td><td colspan=4 rowspan=1 >  </td><td colspan=1 rowspan=1 > Djimon Hounsou </td></tr>
<tr> <th colspan=1 rowspan=1 > Eret </th><td colspan=1 rowspan=1 >  </td><td colspan=2 rowspan=1 > Kit Harington </td><td colspan=5 rowspan=1 >  </td></tr>
<tr> <th colspan=1 rowspan=1 > Mulch </th><td colspan=6 rowspan=1 >  </td><td colspan=1 rowspan=1 > Tim Conway </td><td colspan=1 rowspan=1 > Tim ConwayTom Kenny </td></tr>
</table>
Question:
How many short films comprise the How to Train Your Dragon franchise?
Answer:
How to Train Your Dragon (franchise) consists of four short films: Legend of the Boneknapper Dragon, Book of Dragons (2011), Gift of the Night Fury (2011) and Dawn of the Dragon Racers (2014).