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The Cascading Style Sheets (CSS) specification describes how elements of web pages are displayed by graphical browsers. Section 4 of the CSS1 specification defines a "formatting model" that gives block-level elements—such as p and blockquote—a width and height, and three levels of boxes surrounding it: padding, borders, and margins. [4]
The IE Windows box model bugs were so serious that, when Internet Explorer 6 was released, Microsoft introduced a backward-compatible mode of CSS interpretation ("quirks mode") alongside an alternative, corrected "standards mode". Other non-Microsoft browsers also provided mode-switch capabilities.
CSS Flexible Box Layout, commonly known as Flexbox, [2] is a CSS web layout model. [4] It is in the W3C 's candidate recommendation (CR) stage. [ 2 ] The flex layout allows responsive elements within a container to be automatically arranged depending on viewport (device screen) size.
The CSS1 specification was published in December 1996 by the W3C [4] with the aim of improving web accessibility and emphasising the separation of presentational details in style sheets from semantic content in HTML documents. CSS2 in May 1998 (later revised in CSS 2.1 and CSS 2.2) extended CSS1 with facilities for positioning and table layout.
The CSS box model: This feature allows the web designer to specify dimensions, padding, borders, and margins, [36] and was the focus of the original Acid1 test. [29] Acid2 not only retests margin support but also tests minimum and maximum heights and widths, features new to CSS 2.0.
The CSS Working Group (Cascading Style Sheets Working Group) is a working group created by the World Wide Web Consortium (W3C) in 1997, to tackle issues that had not been addressed with CSS level 1.
width. The width of the box, expressed in pixel or in percent. (default=100%) height. The height of the box, you should express this value exclusively in pixel. (default=230px) contents. The text that should be displayed inside this frame. Note that the scroll bar will appear only if the text is long enough to overflow the given height.
The box width option is optional, and if given a value in pixels followed by "px", or a value in percent followed by "%", will set the width of the box to that amount. For example, 45% would use 45% of the text section width, (not a percentage of the image width). The alignment option is also optional but requires box width to be defined.