"multiple title
" is not an attribute in HTML. Attributes are space-separated.
What you have is a single-label attribute "multiple
" and the second attribute "title="Select one
"
HTML allows for single-label attributes to have their name as a value - this has the same effect and is how XHTML supports single-label attributes, like so:
new { @class="selectpicker", multiple="multiple" title="Select One" }
this will be rendered like this:
<select class="select picker" multiple="multiple" title="Select One">