<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have searched the <a href="https://github.com/mui-org/material-ui/issues">issues</a> of this repository and believe that this is not a duplicate.</li>
</ul>
<h2 dir="auto">Expected Behavior</h2>
<p dir="auto">There is no need for the children prop type to be required. One can set the content with <code class="notranslate">dangerouslySetInnerHTML</code>.<br>
Anyways, it was not required with <code class="notranslate">flow-types</code> implementation.</p>
<h2 dir="auto">Current Behavior</h2>
<p dir="auto">A warning is logged if Typography is an empty tag</p>
<h2 dir="auto">Your Environment</h2>
<table role="table">
<thead>
<tr>
<th>Tech</th>
<th>Version</th>
</tr>
</thead>
<tbody>
<tr>
<td>Material-UI</td>
<td>1.0.0-beta.25</td>
</tr>
<tr>
<td>React</td>
<td>16.2.0</td>
</tr>
</tbody>
</table>
<ul class="contains-task-list">
<li class="task-list-item"><input type="checkbox" id="" disabled="" class="task-list-item-checkbox" checked=""> I have searched the <a href="https://github.com/mui-org/material-ui/issues">issues</a> of this repository and believe that this is not a duplicate.</li>
</ul>
<h2 dir="auto">Current Behavior</h2>
<p dir="auto">When overriding the class name <code class="notranslate">imgFullHeight </code> via <code class="notranslate">classes </code> property injection (according to the docs <a href="https://material-ui-next.com/api/grid-list-tile/" rel="nofollow">here</a>) an error occurs:</p>
<blockquote>
<p dir="auto">InvalidCharacterError<br>
Failed to execute 'add' on 'DOMTokenList': The token provided ('MuiGridListTile-imgFullHeight-558 TitlebarGridList-buggyClass-554') contains HTML space characters, which are not valid in tokens.</p>
</blockquote>
<h2 dir="auto">Steps to Reproduce</h2>
<p dir="auto">The sandbox is a copy-pasta from the <a href="https://github.com/mui-org/material-ui/blob/v1-beta/docs/src/pages/demos/grid-list/TitlebarGridList.js">demo of the docs</a>, with an added class called <code class="notranslate">buggyClass</code></p>
<p dir="auto"><a href="https://codesandbox.io/s/72mv0nz90q" rel="nofollow"><img src="https://camo.githubusercontent.com/90808661433696bc57dce8d4ad732307b5cec6270e6b846f114dcd7ee7f9458a/68747470733a2f2f636f646573616e64626f782e696f2f7374617469632f696d672f706c61792d636f646573616e64626f782e737667" alt="Edit Bug report material-ui imgFullHeight" data-canonical-src="https://codesandbox.io/static/img/play-codesandbox.svg" style="max-width: 100%;"></a></p>
<h2 dir="auto">Your Environment</h2>

<table role="table">
<thead>
<tr>
<th>Tech</th>
<th>Version</th>
</tr>
</thead>
<tbody>
<tr>
<td>Material-UI</td>
<td>1.0.0-beta.26</td>
</tr>
<tr>
<td>React</td>
<td>16.2.0</td>
</tr>
<tr>
<td>browser</td>
<td>Chrome 63.0.3239.132</td>
</tr>
</tbody>
</table>