Predefined HTML Attribute Values

Q

What Are Predefined Attribute Values for an HTML attribute?

✍: FYIcenter.com

A

Some HTML attributes have predefined values. If an attribute has predefined values, you must use one of the predefined values.

For example, attribute "valign" of element "td" has 4 predefined values "baseline", "bottom", "middle", and "top". Here are some examples of how to use "valign" attribute:

<td valign="top"> - Valid, "top" is one of the predefined values of "valign".
<td valign="center"> - Invalid, "center" is not a predefined value of "valign".

⇒ The 'checked' Attribute of some HTML Elements

⇐ Attributes Required by HTML Elements

⇑ HTML Tag and Attribute Syntax

⇑⇑ HTML Tutorials

2023-09-23, ∼2401🔥, 0💬

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, ∼2786🔥, 0💬

HTML Element Content Models
What Are the HTML Element Content Models? There are 4 content models defined for HTML elements: 1. EMPTY - No content. Nothing between the opening tag and the closing tag. For example: <br/> - "br" element has no content. <br></br& amp;gt;- Same as above. <m... 2017-07-30, ∼2747🔥, 0💬

Quoting HTML Element Attribute Values
How To Quote Element Attribute Values Properly? You know that attribute values must be quoted. But how to attribute values properly? Here are some basic rules you should remember: An attribute value must be quoted. An attribute value can be quoted with double quotes as "...". An attribute value can ... 2023-09-23, ∼2723🔥, 0💬

Ampersand Sign in HTML Attribute Values
How To Write Ampersand Sign in Attribute Values? If you need enter an ampersand sign in an attribute value, you can not enter it directly. You must replace it with entity: &amp;. Here are some interesting examples of quoted attribute values: <img src="tt.gif" alt="Tutorials &a... 2023-09-23, ∼2605🔥, 0💬

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, ∼2572🔥, 0💬

Attributes Required by HTML Elements
What Is a Required Attribute in an HTML element? A required attribute is an attribute required by the HTML element. When you write an HTML element, you must include all attributes required by this element in the opening tag. Optional attributes can be omitted in the opening tag. Here are some exampl... 2023-09-26, ∼2555🔥, 1💬

HTML Elements with EMPTY Contents
What Are the HTML Elements Defined with EMPTY Contents? The following HTML elements are defined to use the EMPTY content model: <meta ... /> - Element to provide meta data to the document. <link ... /> - Element to provide a link to a CSS file. <br/> - Eleme... 2017-07-30, ∼2451🔥, 0💬

Predefined HTML Attribute Values
What Are Predefined Attribute Values for an HTML attribute? Some HTML attributes have predefined values. If an attribute has predefined values, you must use one of the predefined values. For example, attribute "valign" of element "td" has 4 predefined values "baseline", "bottom", "middle", and "top"... 2023-09-23, ∼2402🔥, 0💬

HTML Element Contents
What Is the XHTML Element Content? The content of an HTML element is everything you entered between the opening tag and the closing tag of the element. Here are some good examples of XHTML element contents:  <td></td& amp;gt;<!-- ... 2017-07-30, ∼2395🔥, 0💬

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