contain-element/contain-element.min.js

function ContainElement(e){function t(){var o=s.parentElement.offsetWidth,p=s.parentElement.offsetHeight;if(o&&p){if(l=o>p/(n*l)*i*l?o/i:p/n,s.style.width=i*l+"px",s.style.height=n*l+"px",i*l>o)switch(e.halign){case"left":s.style.left="0px";break;case"right":s.style.left=0-(i*l-o)+"px";break;default:s.style.left=0-(i*l-o)/2+"px"}else s.style.left="0px";if(n*l>p)switch(e.valign){case"top":s.style.top="0px";break;case"bottom":s.style.top=0-(n*l-p)+"px";break;default:s.style.top=0-(n*l-p)/2+"px"}else s.style.top="0px"}else window.setTimeout(t,30)}var l=1,s=document.getElementById(e.id),i=e.width||s.offsetWidth,n=e.height||s.offsetHeight;"absolute"!=s.style.position&&(s.style.position="absolute"),"hidden"!=s.parentElement.style.overflow&&(s.parentElement.style.overflow="hidden"),"relative"!=s.parentElement.style.position&&"absolute"!=s.parentElement.style.position&&"fixed"!=s.parentElement.style.position&&(s.parentElement.style.position="relative"),t(),this.update=function(){t()}}