For a full-screen canvas, how do I determine browser client size?

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I've tried various ways of determining the size of the browser's client area in terms of physical pixels, but I get a non-integer result on mobile devices.

For example: window.outerWidth * window.devicePixelRatio on a Pixel 2 with Chrome yields 1081.5 even though I know that the browser's client area is actually 1080 pixels wide.

Another way of seeing this is going to mydevice.io and multiplying JS screen.width with JS pixel-ratio.

Is there a better way to determine physical client size?


There's no way to do this right now, but the proposed ResizeObserver API will probably enable this in the future.

https://github.com/WICG/ResizeObserver/issues/61

Find the dimensions of a web page element : TechWeb : Boston , Follow these instructions to determine the dimensions of any element on your web In the new window that appears in the bottom of your browser, move your​  The worst thing you can do is to resize the Tor browser manually to a random size instead of maximizing it. The adversary won't have a clue about the hardware you're running on, but you will probably be the only person with that browser size on each site you visit. This means your activity can be tracked - the adversary will know that sites A


<button onclick="myFunction()">Try it</button>

    <p><strong>Note:</strong> The innerWidth and innerHeight properties are not supported in IE8 and earlier.</p>

    <p id="demo"></p>

    <script>
    function myFunction() {
        var w = window.innerWidth;
        var h = window.innerHeight;
        document.getElementById("demo").innerHTML = "Width: " + w + "<br>Height: " + h;
    }
    </script>

WebGL Resizing the Canvas., Here's what you need to know to change the size of the canvas. Well, first we can get the browser to stretch the canvas to fill the window with CSS. Example. I've tried various ways of determining the size of the browser's client area in terms of physical pixels, but I get a non-integer result on mobile devices. For example: window.outerWidth * window.devicePixelRatio on a Pixel 2 with Chrome yields 1081.5 even though I know that the browser's client area is actually 1080 pixels wide.


If you want to exclude client taskbars, you can use window.screen.availHeight and window.screen.availWidth.

Else, use window.screen.height and window.screen.width.

Source

HTMLCanvasElement.width, This is one of the two properties, the other being HTMLCanvasElement.height , that controls the size of the canvas. Syntax. var pxl = canvas .width  I can get the user's screen size, and that has helped me to get closer to what I want, but is isn't close enough. I have a web page that should display a graphic exactly in the browser window. The graphic height will just fill the browser window. I need to figure out two things:


Window.devicePixelRatio, devicePixelRatio to determine how much extra pixel density should Set display size (css pixels). var size = 200; canvas.style.width = size +  On mobile devices, the images might fill the full screen, either horizontally or vertically, depending on how the viewer holds their device. OR, they might appear as an inset on a dark background. There’s really no right or wrong size image for Moments. Vertical 9:16 does look awesome in your Moment, but not at all good in your original tweet.


Window innerWidth and innerHeight Property, These properties are read-only. Tip: Use the outerWidth and outerHeight properties to get the width/height of the browser window. Browser Support. The numbers  The width property returns the total width of the user's screen, in pixels. Tip: Use the height property to get the total height of the user's screen. Browser Support. Technical Details. A Number, representing the total width of the user's screen, in pixels. All screen properties in one example: txt += "<p>Total width/height: " + screen.width


Full Screen Canvas, #Keeping it Full Size. The preview area in the editor can be resized, and of course browser windows can be resized. Your canvas is set to a fixed  Close all but one (1) of these smaller windows. "Grab" the corners of the remaining window with your cursor and "stretch" it to the desired size but do NOT maximize it! Now close the resized window. The resized window MUST be the last window closed in order for its size to be remembered. Or you can install IE New Window Maximizer and forget