Creating a canvas element and setting its width and height attributes using jQuery

Question

jQuery try to match each attribute name with a jQuery function name. Matched functions are called.

width and height are jQuery functions, so your original code is equivalent to this:

  var newCanvas = 
    $('<canvas/>',{'class':'radHuh'})
    .width(100)
    .height(100);

width(value) and height(value) functions set CSS width and height of an element.

Relevant jQuery source code line (https://github.com/jquery/jquery/blob/master/src/attributes.js#L308)

if ( pass && name in jQuery.attrFn ) {

attrFn object definition (https://github.com/jquery/jquery/blob/master/src/attributes.js#L288):

attrFn: {
    val: true,
    css: true,
    html: true,
    text: true,
    data: true,
    width: true,
    height: true,
    offset: true
},