Adding a whole new attribute for this seems like overkill, why not use the rel.
<link rel="icon mask" href="..." sizes="..."> That's what the rel list was designed for. On Mon, Jun 15, 2015 at 10:37 AM, Edward O'Connor <eocon...@apple.com> wrote: > When <link> is used to pull in external resources, authors may use > several attributes as hints about the linked resource to help UAs decide > whether or not to load it. > ... > > This combines well with the other resource hints we already have: > > <link rel=icon href=mask.svg type=image/svg+xml sizes=any mask> > > There are any number of properties UAs might want to use when deciding > whether or not to load a resource, so you might think we shouldn't add a > new, one-off attribute every time we identify one. Instead, we could add > a generic hints attribute and have it take a space-separated list of > advisory info about the resource. That space separated list already exists, it's called rel. - E