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This element is dedicated to the multiline text field. It works exactly like a single line text field except it allows line breaks in the text typed by the user. It also accepts a few extra attributes to control its rendering across several lines:.

La opcion puede estar preseleccionada por el usuario. A select box is a widget that lets a user choose one or more predefined values. The difference between a single value select box and a multiple value select box will be detailed in the article: This element extends the existing widgets by providing preset values for given widgets. The most known use case for this is an autocompletion list for text fields. To handle this, here is a little trick to have a nice fallback for those browsers:. Those two elements are a way to graphically represent a given numeric value.

The difference between the two elements is mainly semantic:. A button can be one of three types, depending on the value of the type attribute:. The only noticeable difference is the label of the button itself. Many of the elements used to define form widgets have some of their own attributes. However, there is a set of attributes common to all form elements that give you some control over those widgets.

Here is a list of those common attributes:. We will discuss its use in more detail in the " How to build custom form widgets " article, but here are some good basics to know. Before going further, it's worth noting that support for ARIA and assistive technologies among browsers is far from perfect, but it's improving.

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Just to understand the issue, when a browser encounters an ARIA attribute, it has to send information to the operating system's accessibility layer. Not all browsers are good at doing this cross platform. The assistive technologies, on their own, have to connect themselves to the OS accessibility layer to handle the information that comes from the browsers. Surprisingly, not all assistive technologies do it well. So using ARIA does not mean that your web application will be accessible, but it means that you do your best to achieve this.

Unfortunately, for the time being, ARIA remains a best effort technology, but it's always better than nothing. The attribute is set on the widget element and references the id attribute of the element to use as a label. With the for attribute, you reference the id of the widget but with the aria-labelledby attribute, you reference the id of the label.

This attribute works like the aria-labelledby attribute.

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The difference is mainly semantic. A label defines the essence of an object, while a description provides more information that the user might need.

This attribute is not advised for form elements; you should rely on the aria-labelledby attribute, except if you want to provide extensive information on the current form element. It is to be used as a provider for a longer description. This attribute is used when there is no explicit label in the DOM for a given widget. It lets you provide a widget that will be passed to assistive technologies without actually creating a DOM node for it.

This is the most important ARIA attribute. It lets you give specific semantic information, understandable by assistive technologies, for a given HTML element. There are many roles available, and some of them are dedicated to form widgets. We will see in detail how to use those roles in the article: How to build custom form widgets.

If those roles are extremely useful, know that there are more ; ARIA is a very large specification. Digging into it can help you improve accessibility in areas far afield from HTML forms.

You now have all the knowledge to properly structure your HTML forms; the next article will dig into implementation details and functional expectations: Comprueba tu correo o carpeta de spam para ver si recibiste un correo nuestro. Un formulario bien formado facilita su usabilidad para todo usuario. Una estructura correcta facilita la accesibilidad al formulario.

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