![]() ![]() The second example describes viewports with height of 700 pixels and higher. If you want to describe the screen height, you have to use mediaqueries: device-height. Note: The height of the viewport, for example in a smartphone browser is not the same as the height of the screen, because of the browser bars. The first media query describes a viewport with a height of exactly 480 pixels. Value for the height of the device’s viewport must be a length value and can not be negative. In general you should expect a browser toolbar to be between 40 and 70 pixels high. Thus, a height media query that works perfectly when the page is scrolled up and the toolbar is visible, may misfire when the user scrolls, the toolbar moves out of view, and the layout viewport height changes.įor this reason it’s best to use height media queries sparingly, and, if you need them, to give browsers ample leeway. One serious problem on many mobile browsers is that the layout viewport height, and thus the height media query value, changes when the browser toolbar moves into or out of view. The height media query is always equal to. The height media query’s value is usually the width media query value divided by the screen’s aspect ratio. Frequently, the html element’s height is a lot larger than the layout viewport height. It tells you how many CSS pixels are available vertically for showing content, which is occasionally useful if you need to figure out if an item will be shown “above the fold.”Īlthough the layout viewport width (and thus the media query) is equal to the width of the html element, this does *not* hold for height. Just as the width media query reports the layout viewport’s width, the height media query reports its height. The media feature describes the height of the output device’s rendering surface, such as the viewport height or the height of the page box. You would typically use the environment variables as in the example below. The default value of each keyboard inset is 0px if a fallback value is not provided. The width and height insets are calculated from the other insets for developer ergonomics. The virtual keyboard insets are six environment variables that define a rectangle by its top, right, bottom, and left insets from the edge of the viewport. They are modeled similar to the inset CSS property, that is, corresponding to the top, right, bottom, and/or left properties. The VirtualKeyboard API exposes a set of CSS environment variables that provide information about the virtual keyboard's appearance. log ( 'Virtual keyboard geometry changed:', x, y, width, height ) To detect if the VirtualKeyboard API is supported in the current browser, use the following snippet: if ( 'virtualKeyboard' in navigator ) = event. ![]() The VirtualKeyboard API is available from Chromium 94 on desktop and mobile. A virtual keyboard policy that determines if the virtual keyboard should be shown.A set of CSS environment variables that provide information about the virtual keyboard's appearance.The VirtualKeyboard interface on the navigator object for programmatic access to the virtual keyboard from JavaScript.Situations like this is where the VirtualKeyboard API comes in. The image below shows how the VirtualKeyboard API could be used to optimize the layout of the document dynamically to compensate for the virtual keyboard's presence. Examples include multi-screen mobile devices where the traditional approach would result in "wasted" screen real estate if the virtual keyboard is displayed on just one screen segment, but where the available viewport is shrunk on both screens nonetheless. Traditionally, browsers have dealt with this challenge on their own, but more complex applications may require more control over the browser's behavior. For example, an input field the user is about to type into might be obscured by the virtual keyboard, so the browser has to scroll it into view. This flexibility comes at the price that the browser's layout engine has to be informed of the virtual keyboard's presence and potentially needs to adjust the layout of the document to compensate. Unlike a physical keyboard that is always present and always the same, a virtual keyboard appears and disappears, dependent on the user's actions, to which it can also adapt dynamically, for example, based on the inputmode attribute. Devices like tablets or cellphones typically have a virtual keyboard for typing text. ![]()
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