You can try to run the following code to draw an oval in HTML5 canvas −Example                                  // canvas          var c = document.getElementById('newCanvas');          var context = c.getContext('2d');          var cX = 0;          var cY = 0;          var radius = 40;                    context.save();          context.translate(c.width / 2, c.height / 2);          context.scale(2, 1);          context.beginPath();          context.arc(cX, cY, radius, 0, 2 * Math.PI, false);          context.restore();          context.fillStyle = '#000000';          context.fill();          context.lineWidth = 2;          context.strokeStyle = 'yellow';          context.stroke();           Output

localStorage is used to persist information across multiple sessions. It has a maximum size of 5MB.ExampleYou can try to run the following code snippet to check the size allocated −var sum = 0; // loop for size for(var i in localStorage) {    var amount = (localStorage[i].length * 2) / 1024 / 1024;    sum += amount;    document.write( i + " = " + amount.toFixed(2) + " MB"); } document.write( "Total = " + sum.toFixed(2) + " MB");

Html2Canvas is a JavaScript library that can take screenshot of the whole web page or specific part. It doesn’t take the screenshot but creates the view based on the page information.ExampleBelow given is an example code. Here, html2canvas.js script is included at the . The html2canvas() method is called. Returns the base64 value, which eventually creates image source or an image file.                         Take screenshot                                                      function screenshot(){             html2canvas(document.body).then(function(canvas) {                document.body.appendChild(canvas);             });          }          

For double buffering on the canvas, create a 2nd canvas element and draw to it. After that draw the image to the first canvas using the drawImage() method,// canvas element var canvas1 = document.getElementById('canvas'); var context1 = canvas1.getContext('2d'); // buffer canvas var canvas2 = document.createElement('canvas'); canvas2.width = 250; canvas2.height =250; var context2 = canvas2.getContext('2d'); // create on the canvas context2.beginPath(); context2.moveTo(10,10); context2.lineTo(10,30); context2.stroke(); //render the buffered canvas context1.drawImage(canvas2, 0, 0);

If you want a transparent background in three.js, you need a pass in the alpha parameter to the WebGLRenderer constructors in the below-given code − var renderer = new THREE.WebGLRenderer( {alpha: true } ); // You can leave the clear color at the defaultvalue. renderer.setClearColor( 0x000000, 0 ); //default However, to set the background color, renderer.setClearColor(0xb0f442 );

Steps Follow the below-given steps to convert HTML5 into standalone Android App You need to first create an Android app using Eclipse. Move HTML code to /assets folder −The Assets provide a way to include arbitrary files such as text, XML, music, fonts, and video in your application. Load web view with the file − android_asset/ file  enable javascript Layout for WebView While creating a layout for WebView − WebVieww = new WebView(this); w.loadUrl("http://www.app.com/");

The HTML element is a container for SVG graphics. SVG stands for Scalable Vector Graphics. SVG and useful for defining graphics such as boxes, circles, text, etc. SVG stands for Scalable Vector Graphics and is a language for describing 2D-graphics and graphical applications in XML and the XML is then rendered by an SVG viewer. Most of the web browsers can display SVG just like they can display PNG, GIF, and JPG.The HTML element is used to draw graphics, via JavaScript. The element is a container for graphics.SVGHTML CanvasSVG has better scalability. So it can be printed with ... Read More

To draw HTML Image Elements on a canvas element, use the drawImage() method. This method defines an Image variable with src = "mySVG.svg", and use drawImage on load. var myImg = new Image(); myImg.onload = function() {    ctx.drawImage(myImg, 0, 0); } img.src = "http://www.example.com/files/sample.svg ";

Use the playbackRate property sets the current playback speed of the audio/video. With that, the defaultPlaybackRate property sets the default playback speed of the audio/video. Change the playing speed of videos You can try to run the following code to change the playing speed of videos − /* play video thrice as fast */ document.querySelector('video').defaultPlaybackRate = 3.0; document.querySelector('video').play(); Play video twice as fast The following is to play the video twice as fast − /* play video twice as fast */ document.querySelector('video').playbackRate = 2;

Use createReadStream to send the requested part to the client. The function call createReadStream() will give you a readable stream. ExampleThe following is the code −stream = fs.createReadStream(path); stream.on('open', function () {    res.writeHead(206,{       "Content-Range":"bytes " + begin + "-" + end + "/" +total, "Accept-Ranges":"bytes",          "Content-Length":chunksize, "Content-Type":"new/mp4"    });    stream.pipe(res); });