I made a simple example using Web Components with two custom elements (v1) where one is nested in another. index.html:  <!DOCTYPE html> <html> <head>   <meta charset="utf-8">   <title>Example</title>   &l...
This question is more aimed at user-created shadow DOM elements, but for accessibility I'll use the date input type for this question:  Say for example I have a date input on my page. With a couple of bits edited out, the shadow DOM markup for...
Say if I want to create a custom element using shadow dom. Some elements in the template have class names specified in the linked css file. Now I want to let the css rules have effects on the elements. But I can't achieve that because of the sh...
Is it possible to find elements inside the Shadow DOM with python-selenium?  Example use case:  I have this input with type="date":    <input type="date">     And I'd like to click the date picker button on the right and cho...
Consider, I have few elements which use Shadow DOM to hide their internal div-soup and layout.  Even tough they are different, they share the same CSS style sheet, as they are using the same set of elements that are supposed to be styled in consisten...
I'm trying to use paper-tabs inside new element (tabs-list) but after print tabs I can't use querySelector to change selected one.  Element code (without style):  <link rel="import" href="../components/polymer/polymer.html"...
I am using LitElement to create custom Web Components. I am fairly new at it and decided to try making image slideshow. I used W3Schools slideshow as reference while modifying it to work as LitElement.  The problem is, that when I am trying to use do...
dropdown menu is created in shadowDOM  almost perfect,  but the problem is how to hide the dropdown menu when click on any where else in window  class NavComponent extends HTMLElement {     constructor() {         super();          let template = doc...
foo.html:  <link rel="import" href="bar.html"> <dom-module id="p-foo">     <template>         <p-bar>             <content select=".myContent"></content>         </p-bar>     &...
I'm creating a polymer element. I've made the template and am now working on the script. For some reason document.querySelector is returning null for both class and id selectors. Not sure if this doesn't work with polymer (no reason it sh...

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