android - How to enable zoom in meta tag? -


i working on node.js application aswell operate on mobiles . on handsets not zooming may reason?

my meta tags of page are

<meta name="handheldfriendly" content="true"/> <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no"> <meta name="apple-mobile-web-app-capable" content="yes"> <meta name="apple-mobile-web-app-status-bar-style" content="black">

this page on want add pinch zoom . , meta tags added of index.html parent page of application. cause can ?

<!doctype html> <html lang="en-us"> <head>     <meta charset="utf-8">     <meta http-equiv="x-ua-compatible" content="ie=edge">     <meta name="viewport" content="width=device-width, initial-scale=1">     <link rel="stylesheet" type="text/css" href="style.css">     <link rel="icon" href="favicon.ico">     <script src="samples.js"></script>     <title>chart.js samples</title> </head> <body>     <div class="content">         <div class="header">             <div class="chartjs-title">samples</div>             <div class="chartjs-caption">simple yet flexible javascript charting designers &amp; developers</div>             <div class="chartjs-links">                 <a class="btn btn-chartjs" href="http://www.chartjs.org">website</a>                 <a class="btn btn-docs" href="http://www.chartjs.org/docs">documentation</a>                 <a class="btn btn-gh" href="https://github.com/chartjs/chart.js">github</a>             </div>         </div>          <div id="categories" class="samples-categories"></div>     </div>      <script>         function createcategory(item) {             var el = document.createelement('div');             el.classname = 'samples-category';             el.innerhtml =                 '<div class="title">' + item.title + '</div>' +                 '<div class="items"></div>';             return el;         }          function createentry(item) {             var el = document.createelement('div');             el.classname = 'samples-entry';             el.innerhtml = '<a class="title" href="' + item.path + '">' + item.title + '</a>';             return el;         }          var categories = document.getelementbyid('categories');         samples.items.foreach(function(item) {             var category = createcategory(item);             var children = category.getelementsbyclassname('items')[0];              (item.items || []).foreach(function(item) {                 children.appendchild(createentry(item));             });              categories.appendchild(category);         });     </script> </body> </html> 

<meta name="viewport" content="width=device-width, initial-scale=1">

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