html5 - What is HTML "is" attribute? -


i have seen lot here , there, yet find description or documentation it!

example:

<paper-input-decorator label="your name">     <input is="core-input"> </paper-input-decorator>

in 2017:

there no is attribute in html.

it proposed extension appears in custom elements specification (which evolved polymer spec mentioned below).

it allows existing, standard element custom element. 

<button is="fancy-button" disabled>fancy button!</button>

… allows backwards compatibility. if custom elements not supported browser (the spec still draft , has very limited browser support) fall default behaviour.

in 2014:

it not html. expando-attribute polymer custom elements.

if used extends create polymer element derives existing dom element (something other htmlelement), use is syntax


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