html - Is it ok to define your own tags in HTML5? -


this question has answer here:

in html5, ok use css define own tags? know can looked on bad practice, why? , why isn't there xhtml5 developers can use?

edit===========================================================edit asked how 1 define own tags, here example. wanted move text right 10 pixels. have several options:

  • use div class , change css class
  • i add class or id <li> ect
  • or, create tag moveright, , put in css: moveright {margin-left:10px;}

    • in cases, use div class, if have many times, may want use last option, save myself typing. so, in short laziness. and, loves html5, xml, , css3!

    as of today, no not okay define own html5 tags. html5 spec explicitly forbids it. reason avoid potential clashes official html5 tags added in future , people's custom tags.

    in practice, can it; pretty every browser out there allow it, , work, you'll breaking spec.

    however there spec amendment going through works @ moment aimed @ allowing it. spec not finalised yet, it's being used few people.

    the new spec says if want define own tags, it's fine; add x- front of tag name.

    so create <x-mytag> rather <mytag>.

    i suggest keeping eye on w3c specs see when finalised, , whether make last minute changes, now, i'd run that.

    however, bear in mind intended use creating widgets. in other words, if you're building own combo-box or tree view control, example. not intended arbitrarily creating new tags in document flow -- have classes in html already; if you're doing element basic styling, use div class.

    hope helps.

    references:

    1. current spec: http://www.w3.org/html/wg/drafts/html/master/dom.html#elements

      authors must not use elements, attributes, or attribute values not permitted specification or other applicable specifications, doing makes harder language extended in future.

    2. brand new article html5rocks

      this article job of explaining how create custom elements comply new spec. required reading if want sort of thing.

      but aware of warning @ top of article echos own in answer:

      heads up! article discusses apis not yet standardized , still in flux. cautious when using experimental apis in own projects.

    3. related question: are custom elements valid html5?


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