![how to create a bookmark in html5 how to create a bookmark in html5](https://pubhtml5.com/product-feature/img/define-bookmark-1.jpg)
Try resizing your browser and you’ll see the canvas scale to fit. Effectively, the canvas is still the same dimensions but has been scaled up using CSS. The resize function, which is fired on resize and load events, adjusts the canvas’ style attribute for width and height accordingly while maintaining the ratio. In POP.init, we grab a reference to our canvas element, get its context and adjust the canvas element’s dimensions to 480 × 320. Most of them are obvious: canvas refers to the canvas element in the HTML, and ctx enables us to access it via the JavaScript canvas API. In keeping good practice, we will declare all variables at the start of the program. Being good developers, we don’t want to pollute the global namespace. Window.addEventListener('resize', POP.resize, false) įirst, we create the POP namespace for our game. Window.addEventListener('load', POP.init, false) we use a timeout here because some mobile note: our canvas is still 320 x 480, but
![how to create a bookmark in html5 how to create a bookmark in html5](https://www.freecodecamp.org/news/content/images/2021/06/chromium.png)
set the new canvas style width and height this will create some extra space on theĭ = (window.innerHeight + 50) + 'px' POP.currentWidth = POP.currentHeight * POP.RATIO POP.canvas = document.getElementsByTagName('canvas') these will change when the screen is resized Take a look at the following: // namespace our game
![how to create a bookmark in html5 how to create a bookmark in html5](https://devexpress.github.io/dotnet-eud/interface-elements-for-web/images/rich-text-editor-miscellaneous-insert-bookmark.png)
On the iPhone, bookmarked apps do not display the toolbar at the bottom of the page, thus freeing up valuable real estate. The subsequent apple- prefixed meta tags allow the game to be bookmarked.
HOW TO CREATE A BOOKMARK IN HTML5 FULL SIZE
The meta viewport tag tells mobile browsers to disable user scaling and to render at full size rather than shrink the page down. This could come at the price of a loss in quality, but one clever trick is to make the canvas small and then scale up, which provides a performance boost.īody This means we’ll have to scale our canvas to fit the viewport. Fire up your favorite text editor, pour a strong brew of coffee, and let’s get our hands dirty.Īs mentioned, there is a plethora of resolution sizes and pixel densities across devices. Add a bit of polish and some basic particle effects.Įnough of the background story.Add collision detection and some simple maths to spice things up.Look briefly at using the canvas API to draw to the screen.Cater to the multitude of viewports and optimize for mobile.We’ll develop this in a number of distinct stages: Imaginatively, I’ve titled our little endeavour Pop. It’s a fairly simple game, in which the user bursts floating bubbles before they reach the top of the screen. In this tutorial, we’ll make a relatively simple game that takes you through the basics and steers you away from pitfalls. The mobile browser landscape is changing so quickly that these concerns will soon be a distant memory. So, a few technical challenges won’t put you off, right? What’s more, all of these performance and audio problems are temporary. Now, as a Web developer you’re used to dealing with the quirks of certain browsers and degrading gracefully and dealing with fragmented platforms. My advice is to hold tight and wait for browser vendors to sort this out. iOS won’t even load a sound until the user initiates the action. Lag is a major problem, as is the fact that most devices offer only a single channel. Audio support in mobile browsers is poor, to say the least. Not to mention the increased resolution and pixel density of the iPhone 4 and iPad 3.
HOW TO CREATE A BOOKMARK IN HTML5 ANDROID
A veritable cornucopia of Android devices sport a wide range of resolutions. With iOS 6 and Chrome beta for Android, though, things are improving fast. Mobile browsers are not traditionally known for their blazing JavaScript engines.