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I do not understand why pseudo classes like :focus-within need to be within the :host() function br… Read more Why Do Pseudoclasses On The Host Element Have To Be Inside Of The Host Function?

If I had a script like this Read more How To Access Custom Element From Within A Linked Javascript File?

In the following sample, I am trying to create a menu component to experiment component hierarchy. … Read more Attached Shadowroot Using Polyfill Is Not Query-able

Hello I have a working Polymer 1.0 web page on Chrome and Opera. Now I need the page to run in Fire… Read more Polymer 1.0 On Firefox Referenceerror: Polymer Is Not Defined

I am writing a chrome extension that modifies elements properties as a page is loaded or changes. I… Read more Shadow Dom - Know When Dom Is Rendered/changed

I have div id=outer #shadowRoot div id=inner button In the click handler of the button, … Read more How Do I Traverse Elements Within A Shadow Dom

The spec says: However, note that connectedCallback can be called more than once, so any initializ… Read more Can A Custom Element's `connectedcallback` Be Called More Than Once Before `disconnectedcallback` Is Called?

If I understand it correctly, creating an instance of a web component can be summed up as creating … Read more Share Style Across Web Components "of The Same Type"