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attributes.md

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What is an HTML attribute?

This: attribute="value", and its description goes like this:

An extra configuration for an element that changes the final behaviour of the element it is in.

The parts of an attribute

  1. An attribute name
  2. An optional value with the following notation:
    • an equals sign (=)
    • an attribute value between double quotes ("). Yes, always double quotes. That is the standard in our products

A common attribute is something like this name="userMail". In this case it is an attribute called name which is equals to userMail.

Attributes in an HTML element

HTML elements can be created without attributes at all like this fictional element: <element></element>. Also can contain one attribute like <element attribute="value"></value> or multiple attributes like <element attribute1="value1" attribute2="attribute2" [more attributes] attributen="valuen"></element>.

Attributes without a value

There are some attributes that do not need an explicit value to work, because any empty attribute will be evaluated by the renderer as having the value "true". A real example of this is the required attribute, which will not let the user leave an input to be empty. It look like this: <input type="text" required>. And yes, attributes with and without a value can be mixed and be arranged in any way. Here an example: <element attribute1="value1" attribute2 attribute3="value3" attribute4></element>