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XML documents must contain a root element (one that is the parent of all other elements). All elements in an XML document can contain sub elements, text and attributes. The tree represented by an XML document starts at the root element and branches to the lowest level of elements.
There can be other XML nodes outside of the root element. [4] In particular, the root element may be preceded by a prolog, which itself may consist of an XML declaration, optional comments, processing instructions and whitespace, followed by an optional DOCTYPE declaration and more optional comments, processing instructions and whitespace.
The next column shows attributes of root elements and every unique first child of the root XML element. If the root element has six children named "section," then the grid view will show only one section element and a notation that there are six of them. This iteration continues for the next column.
An element is a logical document component that either begins with a start-tag and ends with a matching end-tag or consists only of an empty-element tag. The characters between the start-tag and end-tag, if any, are the element's content , and may contain markup, including other elements, which are called child elements .
In HTML DOM (Document Object Model), every element is a node: [4] A document is a document node. All HTML elements are element nodes. All HTML attributes are attribute nodes. Text inserted into HTML elements are text nodes. Comments are comment nodes.
Image Source: Getty Images. Why 2025 could be a pivotal year for AMD. Much of the reason why Nvidia experienced such enormous growth in its data center business stems from the fact that the ...
In HTML 4.01 and earlier, no slash is added to terminate the element. HTML5 does not require one, but it is often added for compatibility with XHTML and XML processing. In a well-formed document, all elements are well-formed, and; a single element, known as the root element, contains all of the other elements in the document.
For instance, in most HTML and XHTML document types the "type" attribute is required on the "script" element and the "alt" attribute is required for the "img" element.... This diagnostic can result from use of the EasyTimeline extension, which does not support accessibility and does not generate alternative text for visually impaired readers.