在 SilverStripe 3.1 中,在 mysite/_config.php 中调用 setOption('extended_valid_elements', ...) 对我有用:
HtmlEditorConfig::get('cms')->setOption(
'extended_valid_elements',
'img[class|src|alt|title|hspace|vspace|width|height|align|onmouseover|onmouseout|name|usemap|data*],'
. 'iframe[src|name|width|height|align|frameborder|marginwidth|marginheight|scrolling],'
. 'object[width|height|data|type],'
. 'embed[src|type|pluginspage|width|height|autoplay],'
. 'param[name|value],'
. 'map[class|name|id],'
. 'area[shape|coords|href|target|alt],'
. 'ol[start|type]'
. 'address[class|name|id],'
. 'article[class|name|id],'
. 'aside[class|name|id],'
. 'audio[class|name|id],'
. 'bdi[class|name|id],'
. 'caption[class|name|id],'
. 'canvas[class|name|id],'
. 'datalist[class|name|id],'
. 'details[class|name|id],'
. 'dialog[class|name|id],'
. 'embed[class|name|id],'
. 'figure[class|name|id],'
. 'figcaption[class|name|id],'
. 'footer[class|name|id],'
. 'header[class|name|id],'
. 'keygen[class|name|id],'
. 'mark[class|name|id],'
. 'menuitem[class|name|id],'
. 'meter[class|name|id],'
. 'nav[class|name|id],'
. 'output[class|name|id],'
. 'progress[class|name|id],'
. 'rp[class|name|id],'
. 'rt[class|name|id],'
. 'ruby[class|name|id],'
. 'section[class|name|id],'
. 'source[class|name|id],'
. 'summary[class|name|id],'
. 'time[class|name|id],'
. 'track[class|name|id],'
. 'video[class|name|id],'
. 'wbr[class|name|id]'
);