javascript - dynamic svg in html5 -

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i expected svg nodes first class citizen in html5 unexpected behavior (under firefox 55.0.2 , chrome 54.0.2840.71).

in following html file, expect big circle dynamically added newly created svg element. instead :

  • the inspector tells me dom correctly modified
  • nothing displayed
  • when copy paste dom (copy -> outer html, script deleted) in new file, resulting static html file fine.

what miss ? why have discrepancy between dom , rendered version of ? how can correct ? re-draw ?

when use ns suffixed versions of functions (ie. createelementns , setattributens) similar results , nothing rendered.

here culprit:

<!doctype html> <html> <head>     <meta charset="utf-8">     <title>bug dynamic svg</title>     <script type="text/javascript"> element.prototype.grow = function (tag, attribute_map) {     var child = document.createelement(tag);     if ( attribute_map !== undefined ) {         (let key in attribute_map) {             child.setattribute(key, attribute_map[key]);         }     }     this.appendchild(child);     return child; };     </script> </head> <body> <div id="sandbox"><svg viewbox="0 0 200 200"></svg></div> <script> var g_svg = document.getelementbyid("sandbox").firstelementchild; g_svg.grow('circle', {'cx':"100", 'cy':"100", 'r':"32"}); </script> </html>

and here dom-copy-pasted result via inspector (script removed manually) :

<html><head>     <meta charset="utf-8">     <title>bug dynamic svg</title> </head> <body> <div id="sandbox"><svg viewbox="0 0 200 200"><circle cx="100" cy="100" r="32"></circle></svg></div> </body></html>

elements go in svg namespace, attributes don't.

<!doctype html>  <html>  <head>      <meta charset="utf-8">      <title>bug dynamic svg</title>      <script type="text/javascript">  element.prototype.grow = function (tag, attribute_map) {      var child = document.createelementns('http://www.w3.org/2000/svg', tag);      if ( attribute_map !== undefined ) {          (let key in attribute_map) {              child.setattribute(key, attribute_map[key]);          }      }      this.appendchild(child);      return child;  };      </script>  </head>  <body>  <div id="sandbox"><svg viewbox="0 0 200 200"></svg></div>  <script>  var g_svg = document.getelementbyid("sandbox").firstelementchild;  g_svg.grow('circle', {'cx':"100", 'cy':"100", 'r':"32"});  </script>  </html>





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