What Is a Sub-element in HTML?

Q

✍: FYIcenter.com

A

A sub-element is an HTML element that is included inside the content of another HTML element. The inner element is called the sub-element or child element. The outer element is called the parent element. Together they are called nested elements.

Note that which element is allowed to be included inside another element is defined by the XHTML specification. For example, element "p" is allowed inside "body", but it is not allowed inside "head".

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â‡’Introduction of HTML Element Content Syntax

â‡’â‡’HTML Tutorials

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Introduction of HTML Element Content Syntax
Where to find tutorials of introduction to HTML element content syntax and basics rules? Here is a list of tutorials to answer many frequently asked questions compiled by FYIcenter.com team in introduction to HTML element content syntax and basics rules. Clear answers are provided with tutorial exer... 2017-07-30, 1294👍, 0💬

Incorrect HTML 'head' Element
What Is Wrong with This XHTML "head" Element? If you have trouble passing the XHTML 1.0 validation on your head element, check the following common mistakes: Missing the title element. Not closing the meta element as <meta ... >. You must close all elements in XHTML documents. Not clos... 2017-06-28, 1246👍, 0💬

HTML Element Content Models
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The 'checked' Attribute of some HTML Elements
What Is Wrong with My "checked" Attribute Values? Attribute "checked" is an optional attribute for HTML element "input". In XHTML specification, attribute "checked" has only one predefined value: "checked". However, in HTML specification, attribute "checked" requires no value. If you are converting ... 2017-07-30, 1172👍, 0💬

HTML Document Example
What Does an HTML document look like? An HTML document is a normal text file with predefined tags mixed with the text contents of the document. Tags are enclosed in pairs of angle brackets: "<" and ">". Below is how a simple HTML document looks like if you open it in a text editor: &am... 2017-02-20, 1171👍, 0💬

XHTML 'meta' Tag/Element
What Is an XHTML "meta" Tag/Element? A "meta" element is optional child element of the head element. A "meta" element provides one piece of extra information about the XHTML document. Here are some important rules about "meta" elements: Meta elements are optional. Meta elements can only be used as s... 2017-06-28, 1156👍, 0💬

HTML Keywords 'meta' Tag/Element
What Is the HTML Keywords "meta" Tag/Element? The keywords "meta" element is a special meta element that provides a list of keywords about the HTML document. The keywords "meta" element must include the "name" attribute as, name="keywords". Here is an example: <meta name="keywords" content="X... 2017-06-23, 1132👍, 0💬

Missing XHTML 'title' Element
What Happens If the XHTML "title" Element is Missing? XHTML 1.0 requires you write the title element inside the head element. If you forget to include the title element, the XHTML validator will return an error to you. Here is how you can test this yourself. Go the W3 XHTML validator Web site: http:... 2017-06-28, 1125👍, 0💬

HTML Description 'meta' Tag/Element
What Is the Description "meta" Tag/Element? The description "meta" element is a special meta element that provides a short descript about the HTML document. The description "meta" element must include the "name" attribute as, name="description". Here is an example: <meta name="description" co... 2017-06-28, 1118👍, 0💬

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