div in a form or mixing form with div [HTML]

I thought I cant mix between form tag and div tag, I’m talking about HTML. In a basic HTML explanation I thought form tag cant be mixed with other tag than form tag itself. Here’s example of form tag from w3c

1
2
3
4
5
6
7

<form action="form_action.asp" method="get">
First name: <input name="fname" type="text" />

Last name: <input name="lname" type="text" />

<input type="submit" value="Submit" />
</form>

But I come across to this theme and realize its’ form theme doesn’t include a form tag, how could it be…
Where I could place action page even the form tag doesn’t included. So it’s easy we just need to warp all form element, with a form tag. here’s an example of div tag in a form tag

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

<form>
<div class="grid_16">
<h2>Submit News Article</h2>
Something went wronk.</div>
<div class="grid_5">
<label for="title">Title <small>Must contain alpha-numeric characters.</small></label>
<input name="title" type="text" /></div>
<div class="grid_5">
<label for="title">Slug <small>Must contain alpha-numeric characters.</small></label>
<input name="title" type="text" /></div>
<div class="grid_6">
<label for="title">Category</label>
<select>
<option>Draft</option>
<option>Published</option>
<option>Private</option>
</select></div>
<div class="grid_16">
<label>Summary <small>Will be displayed in search engine results.</small></label>
<textarea></textarea></div>
<div class="grid_16">
<label>Article <small>Markdown Syntax.</small></label>
<textarea class="big"></textarea>
<input type="reset" value="Reset" />
<input type="submit" value="Post" /></div>
</form>

I just need to add action attribute and method attribute if necessaries