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There is a difference in behavior between MutationObserver and this shim in IE10, causing the target for a MutationRecord to be different from the expect value. This happens because when you append a node with children in IE10 it'll call the DOMNodeInserted for the node and its children seperately. The test has an if statement because the behavior is different between IE10 and chrome, making both outcomes valid.
webcomponents.js
A suite of polyfills supporting the Web Components specs:
Custom Elements: allows authors to define their own custom tags (spec).
HTML Imports: a way to include and reuse HTML documents via other HTML documents (spec).
Shadow DOM: provides encapsulation by hiding DOM subtrees under shadow roots (spec).
This also folds in polyfills for MutationObserver and WeakMap.
Releases
Pre-built (concatenated & minified) versions of the polyfills are maintained in the tagged versions of this repo. There are two variants:
webcomponents.js includes all of the polyfills.
webcomponents-lite.js includes all polyfills except for shadow DOM.
Manually Building
If you wish to build the polyfills yourself, you'll need node and gulp on your system:
- install node.js using the instructions on their website
- use
npmto install gulp.js:npm install -g gulp
Now you are ready to build the polyfills with:
# install dependencies
npm install
# build
gulp build
The builds will be placed into the dist/ directory.
Contribute
See the contributing guide