"placeholder" from "textarea" does not appear

I have a textarea with a placeholder which according to the documentation ( is perfectly valid and should work:

Example in JSFiddle

Part of form 

<?php

/* Apenas o código referente à textarea
 */
$oc_message = isset($postArr["oc_message"]) ? cleanStr($postArr["oc_message"]) : '';

$form = '
<div class="form-group">
    <label for="oc_message">
        '.ucfirst(I18N_WORD_MESSAGE).' <small class="text-danger">*</small>
    </label>
    <textarea class="form-control" id="oc_message" name="oc_message" placeholder="'.I18N_PLACEHOLDER_MESSAGE.'" rows="10">
       '.$oc_message.'
    </textarea>
</div>';
?>

However, the text of placeholder does not appear in the same!

Generated HTML: 

<div class="form-group">
    <label for="oc_message">
        Mensagem 
        <small class="text-danger">*</small>
    </label>
    <textarea rows="10" placeholder="Introduza a sua mensagem" name="oc_message" id="oc_message" class="form-control">                          
    </textarea>
</div>

Question

Why isn't placeholder showing up?

Author: Zuul, 2014-01-23
Source

2 answers

The problem is that the placeholder appears only when the textarea is empty, with no text at all. Yours is not, you have inserted the spaces of the ID in it.

Experiments: 

<form action="" method="post">
    <div>
        <textarea id="message" name="message" placeholder="A sua mensagem"></textarea>
    </div>
</form>
 10
Author: Guilherme Bernal, 2014-01-23 13:13:50

In the case of the textarea tag, for the placeholder to work, the opening and closing of the tag must be on the same line and without spaces.

In your case textarea thinks the line break is content and placeholder does not appear.

Thus one should use: 

<textarea id="message" name="message" placeholder="A sua mensagem"></textarea>

Fiddle

 6
Author: Sergio, 2020-06-11 14:45:34