JSFiddle - React, Tailwind, and code Playground

HTML

disabled: <button type="button" disabled>button</button><br><br>
form :<form action="index.php" method="get" id="deneme">
<input type="text" name="bir" ><br>
<input type="text" name="iki"><br>
</form>
<button type="submit" form="deneme" value="Submit">submit</button><br><br>
formaction:
<form action="index.php" method="get">
<input type="text" name="bir" ><br>
<input type="text" name="iki"><br>
<button type="submit">Submit</button><br>
<button type="submit" formaction="deneme.php">formaction submit</button><br><br>
</form>
formenctype:    
<form action="index.php" method="post">
<input type="text" name="bir" value="bir"><br>
<button type="submit">submit</button>
<button type="submit" formenctype="text/plain">button formenctype</button><br><br>
</form>
formmethod:    
<form action="index.php" method="get">
<input type="text" name="fname"><br>
<input type="text" name="lname"><br>
<button type="submit">Submit</button>
<button type="submit" formmethod="post" formaction="index.php">button formethod</button><br><br>
formnavalidate:<br>
<form action="index.php" method="get">
E-mail: <input type="email" name="numara"><br>
<button type="submit">Submit</button><br>
<button type="submit" formnovalidate>formnovalidate</button>
</form>