How to increase and decrease text size in web page? [closed]

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How do I increase and decrease text size on a web page using PHP, CSS, or JQuery?

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You can increase text size on the whole page (for all elements that inherit text size from the 'body') with:

function setFontSize(size) {
    $('body').css('font-size', '' + size + 'px');
}

Demo here.

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Check the font-size CSS property

Reference: http://www.w3.org/TR/CSS2/fonts.html#font-size-props

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Set text-size on the text container (a p, a div, a span, ...).

<p style='font-size:120%'>