Polymer 1.X and 2.X collapsible container
bower install --save polymer-collapsible-container<collapsible-container header="Test Collapsible">
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</collapsible-container><accordion-container>
<collapsible-container header="Test Accordion">
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</collapsible-container>
<collapsible-container header="Test Accordion 2">
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</collapsible-container>
<collapsible-container header="Test Accordion 3">
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</collapsible-container>
</accordion-container>First, make sure you have the Polymer CLI installed. Then run polymer serve to serve element locally.
$ polymer serve
$ polymer test
Your application is already set up to be tested via web-component-tester. Run polymer test to run your application's test suite locally.