IE10 sanitizes a bunch of content attribute values

[rafaelw]

e.g.

var elmName, attrName;
var el = document.createElement(elmName);
el.setAttribute(attrName, '{{ foo }}');
alert(el.getAttribute(attrName)); // alerts 'null' in IE, but '{{ foo }}' in Gecko/WK/Blink.

E.g. elmName/attrName = input[type='number'] / value

• / style

Hixie says content attributes should never be sanitized. IE apparently disagrees.

Sad clown.

[arv]

Clearly an IE bug

[rafaelw]

Yes, but we still need to work in IE. I propose that when template finds, e.g.

<div _foo="{{ bar }}">

that it acts as if it had seen

<div foo="{{ bar }}">

This should cover the case of IE sanitizing attributes, as well as the issue of non-template browsers lacking inert content (e.g. <img _src="{{ foo }}.png">

[neonstalwart]

@rafaelw some of your comments don't seem to come through on github - maybe you need to use fenced code blocks

[rafaelw]

sorry. fixed.

[rafaelw]

Fixed: https://github.com/Polymer/TemplateBinding/commit/3932ebe