Use tabindex to Specify the Order of Keyboard Focus for Several Elements
Solutions
Solution 1 (Click to Show/Hide)
Following the instructions:
Add a tabindex attribute set to “1” to the search input, and a tabindex attribute set to “2” to the submit input.
the lines 16 and 17:
<input type="search" name="search" id="search">
<input type="submit" name="submit" value="Submit" id="submit">
become:
<input tabindex="1" type="search" name="search" id="search">
<input tabindex="2" type="submit" name="submit" value="Submit" id="submit">
In this way the search input and submit input form controls to be the first two items in the tab order.