auto-initialization with data-parallax attribute: it's simple but restricted in terms of features.
targeted javascript initialization: requires a javascript call, allows for more complex features.
with data attributes the inner html content is not supported, please check the readme on how to use the javascript initialization and please don't mix the two!
i pasted the jquery and linked the js file.but while including the picture in div tag the source is not opening to upload a file./please help