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Forms in HTML documents - World Wide Web Consortium
17.1 Introduction to forms. An HTML form is a section of a document containing normal content, markup, special elements called controls (checkboxes, radio buttons ...
HTML 标签
定义和用法 标签定义选项组。 optgroup 元素用于组合选项。当您使用一个长的选项列表时,对相关的选项进行组合会使 ...
H85: Using OPTGROUP to group OPTION elements inside a ...
The objective of this technique is to group items in a selection list. A selection list is a set of allowed values for a form control such as a multi-select list or a ...
Element Index | HTML5 Doctor
This is a quick reference of elements that are new or have been redefined in HTML5. For each element there is a short description, a link to the specification, and a ...
Options | Select2 - The jQuery replacement for select boxes
Options. A traditional element with multiple attribute activated.