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POdiv and span css styles for form buttons
 

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    <p>I used the SO questions <a href="https://stackoverflow.com/questions/286275/gray-out-image-with-css">Gray out image with CSS?</a> and <a href="https://stackoverflow.com/questions/2091168/disable-a-link-using-css">Disable link using css</a> to construct a css wrapper that would grey out a button, and also prevent clicks to it. I tried first in a separate css file, but this example uses inline css styles and gives the same result. Here are 4 buttons:</p> <pre><code>&lt;!DOCTYPE html&gt;&lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head&gt; &lt;title&gt;&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;form&gt; &lt;span style="opacity:0.4; pointer-events: none;"&gt; &lt;input type='submit' value='Span Inside' /&gt; &lt;/span&gt; &lt;/form&gt; &lt;form&gt; &lt;div style="opacity:0.4; pointer-events: none;"&gt; &lt;input type='submit' value='Div Inside' /&gt; &lt;/div&gt; &lt;/form&gt; &lt;div style="opacity:0.4; pointer-events: none;"&gt; &lt;form&gt; &lt;input type='submit' value='Div Outside' /&gt; &lt;/form&gt; &lt;/div&gt; &lt;span style="opacity:0.4; pointer-events: none;"&gt; &lt;form&gt; &lt;input type='submit' value='Span Outside' /&gt; &lt;/form&gt; &lt;/span&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>All four buttons in this example do not respond to clicks in any of Firefox 15.0.1, Safari 6.0 or Chrome 21.0.1180.89, which is what I expected.</p> <p>In Firefox, all 4 buttons are greyed out, opacity 0.4, which is what I expected.</p> <p>In Safari and Chrome, the first 3 buttons are greyed out, but the 4th button, with the span elements outside the form elements, has opacity 1.0.</p> <p>Is there a bug in the browsers, or is it in in my understanding, please?</p>
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    1. COspan allows only phrasing context inside it. It should not allow a nested form element and, as you can see, every browser may behaves differently
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    2. COThe markup is non-conformant so you should not be surprised when browsers coerce your markup into a less invalid form. For instance, very old versions of Firefox used to do this too.
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    3. COThanks for your explanations. So, if I want to wrap a style around arbitrary content and have it not insert newlines, I should write <div style="opacity:0.4; pointer-events: none; display:inline-block; >content</div> ?
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