Regardless of how it is created, all of the ways in which button is specialĪpply to such "plastic buttons" as well: their focus behavior, ability to participate in form submission, the disabled attribute, and so on.Ĭustomized built-in elements are designed to allow extension of existing HTMLĮlements that have useful user-agent supplied behavior or APIs. However, it will be added to the output when Note that when creating a customized built-in element programmatically, the is attribute will not be present in the DOM, since it was not explicitly assert (plasticButton2 instanceof HTMLButtonElement ) assert (plasticButton2 instanceof PlasticButton ) Ĭonsole. localName ) // will output "button"Ĭonsole. textContent = "Click me!" Īnd as before, the constructor will also work: const plasticButton2 = new PlasticButton () Ĭonsole. HTMLElement: class FlagIcon extends HTMLElement ) To do this, we first declare a class for the custom element, extending 4.13.1.1 Creating an autonomous custom elementįor the purposes of illustrating how to create an autonomous custom element, let'sĭefine a custom element that encapsulates rendering a small icon for a country flag. The name attribute specifies the name of an object. On the capabilities of custom elements-both functionally and semantically-that prevent them fromįully explaining the behaviors of HTML's existing elements, we hope to shrink this gap over The name property sets or returns the value of the name attribute of an
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