New attributes in HTML5: introduction to five global attributes

In HTML5, there is a new attribute that is not found in HTML: global attributes. As the name suggests, global attributes refer to attributes that can be used by any element. In the following article, we will introduce five commonly used global attributes.

contentEditable property

contentEditable was developed by Microsoft. A global property that is decompiled and put into use by other browsers. Its main function is to allow the user to edit the content of the element. The element being edited must be the element that has the mouse focus, and a caret must be provided after clicking to prompt the user that the content of the element is allowed to be edited. The contentEditable property is a Boolean property that can be specified as true or false. This attribute also has an inherit state of a hidden attribute. When it is true, it allows users to edit it; when it is false, the element cannot be edited by the user; when it is not specified, it is determined by the inherit state. If the parent element is editable, the element is also editable. . Supported contentEditable attribute elements include A, DD, DIR, DIV, BUTTON, FORM, DL, DT, FONT, DFN, hn, CODE, ABBR, etc.

designMode attribute

The main function of the designMode attribute is to specify whether the entire page is editable. When the page is editable, any support in the page Elements with the contentEditable attribute become editable. The designMode attribute has two values ​​"on" and "off". When the attribute is "on", the page is editable; when the attribute is "off", the page is not editable. However, the support of each browser is different. IE8 does not support the designMode attribute, IE9 supports the designMode attribute, fixfox and Opera browsers support the designMode attribute, and Chrom and Safari browsers support the designMode attribute in embedded frames.

hidden attribute

All elements in HTML5 are allowed to use the hidden attribute. It is similar to the hidden attribute in the input element, making the element invisible. When the hidden attribute is set to true, the element is invisible; when the hidden attribute is set to false, the element is visible.

spellcheck attribute

The spellcheck attribute is mainly a new attribute provided for the two text input boxes, input element and textarea. Its function is to spell and spell the input content. Grammar check. It has a special feature, that is, the attribute value must be declared true or false. If the element has a readonly attribute or the disabled attribute is true, no spell checking is performed. Browsers such as Firfox, IE, Chrome, and Safari all support this attribute.

tabindex attribute

Tabindex refers to the concept of program development, which means to continuously tap the Tab key to gain focus on the controls in the window or page, and to traverse the controls of the window. The tabindex of each control indicates which one is accessed. This attribute was useful when editing web pages before, but now the traversal order is determined based on the position of the element, so it is no longer needed. However, tabindex has a function. Only link elements and form elements can gain focus through keystrokes. If you use the tabindex attribute on an element, the element can also gain focus. When the focus() statement is executed, the element can gain focus. But there will be a problem. The element will get focus through the tab, and at this time we don't want the element to get focus. This is not the result we want.

This problem can be solved by setting the tabindex value of the element to a negative number. When the tabindex is a negative value, the element can be focused programmatically, but the element will not be focused when the Tab key is pressed. This is very useful in complex pages. The clever use of this attribute in HTML5 plays a great role.

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