html - Adding pinch-zoomable div image to a non-scalable viewport on mobile devices -


consider following viewport meta tag:

<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no, minimal-ui" />

the content on page non-scalable , mobile responsive. sometimes, need overlay large image on top of it, , allow user pinch-zoom image.

#overlay_div {     position: fixed;     top: 0;     left: 0;     height: 100%;     width: 100%;     background-color: #dddddd;     z-index: 550000;     overflow: scroll;     -webkit-overflow-scrolling: touch; }  <div id="overlay_div">     <img src="largeimage.jpg" width="100%"> </div>

currently, aware of 2 possible options:

  1. programmatically change viewport meta allow user scaling (possible cross-browser implications, causes content underneath scale not desirable)
  2. use hammer.js manually handle pinch event , scale div/image accordingly (seems complex possible compatibility implications).

does know proper way this, cross-browser compatibility? hoping there may simple css solution.

thanks

in general go zoomable version @paulie_d recommended; use on of pages:

<meta name="viewport" content="width=device-width, initial-scale=1.0">

here google´s recommendation.

if have no other choice, recommend open image in same browser tab/window meta tag shown above , back link navigation. native pinch-zoom available.

this example such implementation (you need mobile user agent): https://m.notebooksbilliger.de/notebooks/hp+compaq+15+h024sg


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