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HTML Template Element Documentation: Usage and Attributes

By

palmfacehn

9mo ago· 8 min readen
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Summary

The article provides technical documentation for the HTML <template> element, explaining its purpose as a mechanism for holding HTML fragments that can be used later via JavaScript or generated into shadow DOM. It covers the element's attributes including the global attributes and the shadowrootmode attribute with its open and closed values, detailing how the HTML parser creates ShadowRoot objects and the differences between open and closed modes for JavaScript accessibility.

Key quotes

· 5 pulled
The <template> HTML element serves as a mechanism for holding HTML fragments, which can either be used later via JavaScript or generated immediately into shadow DOM.
Creates a shadow root for the parent element. It is a declarative version of the Element.attachShadow() method and accepts the same enumerated values.
Exposes the internal shadow root DOM for JavaScript (recommended for most use cases).
Hides the internal shadow root DOM from JavaScript.
The HTML parser creates a ShadowRoot object in the DOM for the first <template> in a node with this attribute set to an allowed value.
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