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Read properties off of proto during configuration. #4314

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merged 4 commits into from
Feb 22, 2017
Merged

Read properties off of proto during configuration. #4314

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a68c0b3
Read properties off of proto during configuration.
kevinpschaaf Feb 16, 2017
f2a12cb
Fix test failures by feature detecting instance `properties` accessors.
kevinpschaaf Feb 17, 2017
a0ad3bb
Check documentElement instead of body to guarantee it's there.
kevinpschaaf Feb 22, 2017
72f21fe
[ci skip] Update comment to include reference to problem browser.
kevinpschaaf Feb 22, 2017
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13 changes: 12 additions & 1 deletion src/standard/configure.html
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,11 @@

var usePolyfillProto = Polymer.Settings.usePolyfillProto;

// When true, `this.properties` is bad juju due to obsolete `properties`
// accessors on instances of HTMLElement
var avoidInstanceProperties =
Boolean(Object.getOwnPropertyDescriptor(document.documentElement, 'properties'));

Polymer.Base._addFeature({

// storage for configuration
Expand Down Expand Up @@ -101,7 +106,13 @@
this._configureProperties(this.behaviors[i].properties, config);
}
// prototypical behavior
this._configureProperties(this.properties, config);
// Read `properties` off of the prototype, as an concession to non-spec
// compliant browsers where a.) HTMLElement's have a non-spec `properties`
// property, and b.) the `properties` accessor is on instances rather
// than `HTMLElement.prototype`; going under the instance to the prototype
// avoids the problem.
this._configureProperties(avoidInstanceProperties ?
this.__proto__.properties : this.properties, config);
// TODO(sorvell): it *may* be faster to loop over _propertyInfo but
// there are some test issues.
//this._configureProperties(this._propertyInfo, config);
Expand Down