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For example, lets say we want to do querySelectorAll('canvas') to get all canvases in the document, including the ones in the shadow dom. Is that possible with polymer?
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To access these Shadow DOM elements, we need to use the JavascriptExecutor executeScript() function. If you look at the DOM structure, every element that includes Shadow DOM also has a shadowRoot property that describes the underlying elements.
Shadow DOM is a new property of DOM used for building components. Example. In the following code, the header component includes page title and menu button. <header-demo> <header> <h1> <button> Shadow DOM allows locating the children in a scoped subtree, which is known as shadow tree.
There's no selector that can directly affect shadow DOM styles from the document. But just as we expose methods to interact with our component, we can expose CSS variables (custom CSS properties) to style it. Custom CSS properties exist on all levels, both in light and shadow.
No. For a period of time there was a proposal whereby you could use the /deep/ combinator, but it was found to be bad for encapsulation and has been deprecated. Code that relies upon it will break.
Instead, if you need to, you can take an element and look into its shadow root specifically and query within it.
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