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An online rich-text editor is the interface for editing rich text within web browsers, which presents the user with a "what-you-see-is-what-you-get" (WYSIWYG) editing area. The aim is to reduce the effort for users trying to express their formatting directly as valid HTML markup. Though very early browsers could ''display'' rich text, user data entry was limited to text boxes with a single font and style (implemented with the <TEXTAREA> HTML element). Internet Explorer was the first to add a special "designMode" which allowed formatted parts of a document to be edited by the user using a cursor. Mozilla followed suit in version 1.3,〔(【引用サイトリンク】title=Rich-Text Editing in Mozilla )〕 and most major browsers now implement this informal standard in some capacity. The technical capabilities needed to implement an online rich text editor are still not covered by the W3C specifications for HTML4. Nevertheless, popular services like Gmail and WordPress rely on rich text editing as their main user interface. For HTML5, some standardization is being made on a DOM property called "contentEditable"—which resembles Internet Explorer's extension. Many of the Online office suites tend to provide online text editing and formatting functionality. == Design challenges == The most popular editors used for creating the rich text component of web pages have the following design objectives: * The editing view matches the final appearance of published content with respect to fonts, headings, layout, lists, tables, images and structure * The buttons, controls and key strokes deliver the same behaviour as the word processor or text editor that the user is most familiar with. * The HTML code that is generated is compliant with web standards (such as W3C) and the browser on which the content will be viewed. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Online rich-text editor」の詳細全文を読む スポンサード リンク
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