It all started when I wanted to write some non-presentable Custom Elements
be able to find them in DOM using some generic rule.
Polymer has plenty of such elements: <polymer-ajax>, etc. Polymer demos
have them as well: Polymer/TodoMVC has <td-model> for example.
Even HTML has elements that are not presentable: SCRIPT, STYLE, LINK, BASE,
META, etc - and recently TEMPLATE.
W3C HTML5 spec is not very clear about such elements and what makes them
non-presentable. It seems that presentable elements are those categorised
as Flow Content (or Palpable Content - anyone can describe the
difference?). Non-presentable are sometimes categorised as Metadata Content
(e.g. SCRIPT, TEMPLATE) or not categorised at all (e.g. SOURCE, TRACK)
How can I reliably define (and later check) that a Custom Element is not
meant for presentation?
I checked sources of <polymer-ajax> and it seems that this issue was not
yet addressed there. <polymer-xhr> has <style>:host { display:
none}</style> which looks like a cheat because I cannot determine if
"display: none" is just temporary style or intended permanent property.
I want to write few non-presentable Custom Elements and I am considering
extending LINK or META elements for that matter, because this let's me
accurately determine that these elements are not meant for presentation.
Any other ideas?
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