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Bootstrap (formerly Twitter Bootstrap) is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains HTML , CSS and (optionally) JavaScript -based design templates for typography , forms , buttons , navigation , and other interface components.
Two notable and widely used examples are Bootstrap and Foundation. CSS frameworks offer different modules and tools: reset style sheet; grid especially for responsive web design; web typography; set of icons in sprites or icon fonts; styling for tooltips, buttons, elements of forms
This is used for update or service pack information. Sometimes referred to as "point releases" or minor versions. The technical difference between version and update will be different for certain vendors and products.
PHP development began in 1993 [9] when Rasmus Lerdorf wrote several Common Gateway Interface (CGI) programs in C, [23] [24] which he used to maintain his personal homepage.He extended them to work with web forms and to communicate with databases, and called this implementation "Personal Home Page/Forms Interpreter" or PHP/FI.
The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.