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function generate_parallax_element( selector, context ) { context = context || document; var elements = context.querySelectorAll( selector ); return Array.prototype.slice.call( elements ); } window.addEventListener( "scroll", function() { var scrolledHeight= window.pageYOffset; generate_parallax_element( ".page-hero" ).forEach( function( el, index, array ) { var limit = el.offsetTop + el.offsetHeight; if( scrolledHeight > el.offsetTop && scrolledHeight <= limit ) { el.style.backgroundPositionY = ( scrolledHeight - el.offsetTop ) / hero.parallax + "px"; } else { el.style.backgroundPositionY = "0"; } }); });