What is the standard mode in the context of web development?
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Answer from AI
Standard mode is the mode in which a web page is displayed by the browser, where rendering is done according to the specifications of the W3C and WHATWG consortium (HTML, CSS). It is contrasted with quirks mode, which mimics the behavior of older browser versions to support legacy code.
Switching the browser to standard mode is usually ensured by having a complete and correct DOCTYPE at the beginning of the HTML document, for example:
<!DOCTYPE html>
In standard mode, the CSS box model behaves predictably: the width and height properties define the size of the content of the element, and margins, borders, and padding are added to these sizes (unless the box-sizing property is changed).
In quirks mode, on the other hand, browsers may apply various heuristics to determine sizes, which can differ significantly from the specifications, leading to unpredictable behavior and cross-browser issues.