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<form action="/action_page.php">
<input type="text" name="username"> <input @(33)> </form>
<form action="/action_page.php">
<input type="text" name="username"> <input type="submit" value="Submit Form"> </form>
<form action="/action_page.php">
<input type="text" name="username"> <input type='submit' value='Submit Form'> </form>
<form action="/action_page.php">
<input type="text" name="username"> <input value='Submit Form' type='submit'> </form>
<form action="/action_page.php">
<input type="text" name="username"> <input value="Submit Form" type="submit"> </form> 不正确
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<form action="/action_page.php">
<input type="text" name="username"> <input w3exercise_input_no_0> </form>
<form action="/action_page.php">
<input type="text" name="username"> <input w3exercise_input_no_0> </form> |