jquery - How make fixed webkit-mask for div? -

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suppose have 2 blocks div superposed, difference between them in lower block content div applied effect assume black-white filter -webkit-filter: grayscale (100%);

if div-block p2 reduced in size height , synchronize scrolling achieve transition effect of color content in black-white.

however, site try write designed mobile devices , ios have problem dynamic position scrolling. alternatively can use iscroll, slows work...

so idea came cut div-block id="p2" using webkit-mask mask , fix webkitmask relative page. more detail in gif-animation: http://outsins.com/mask.gif

<div id="scroll" style="-webkit-overflow-crolling:touch;left:200px;width:500px;height:500px;">  <div id="p1" style="position:absolute;width:500px;height:1000px;z-index:1;-webkit-filter: grayscale(100%);"> text </div>  <div id="p2" style="position:absolute;width:500px;height:1000px;z-index:2; color: blue;-webkit-mask:url(heartmask.png) no-repeat center center;-webkit-mask-attachment: fixed;"> text </div>  </div>

i put 2 superimposed block in common container , added -webkit-overflow-scrolling:touch. while scrolling 2 div-block (p1 , p2) move simultaneously. on top layer (id: p2), added webkitmask -webkit-mask: url (heartmask.png) , make fixed: -webkit-mask-attachment: fixed; thus, content should clipped mask supposedly should not move.

but -webkit-mask-attachment: fixed; not work, , mask moved whole page http://outsins.com/mask2.gif

i did not find example -webkit-mask-attachment: fixed;

and think wrong somewhere

where mistake? how can fix this?

sorry bad english...

thank you

-webkit-mask-attachment: fixed; not supported majority of browsers. supported chome , safari. (see browser compatibility in mdn).

try use position:fixed div#p2:

<div id="p2" style="position:fixed;"></div>

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