![]() Sure, it all sounds good in theory, but let’s dig deeper. Measuring the power of content-visibility So, postponing rendering these elements reduces the initial rendering time so a user can see the content faster. This makes sense because the user will not initially see the elements that stay outside of their screen, meaning that these elements are unnecessary during the initial page load. ![]() content-visibility has an auto option that detects whether an element is within the viewport of the user and skips the rendering for the elements that haven’t yet enter the viewport yet. If the browser didn’t render some of the elements within the page, scrolling would be a nightmare because it wouldn’t be possible to calculate the page height correctly. Rendering all the elements at once allows the browser to calculate the dimensions of a page correctly while keeping the page layout and the scrollbar consistent throughout the page. Users can see the elements that fit into their viewport and view the other elements within the page by scrolling. By default, browsers render all the elements within the DOM tree that can be viewed by the user. The key capability of content-visibility is that it allows us to postpone the rendering of HTML elements we choose. How content-visibility improves rendering performance In this blog post, we’ll learn about content-visibility, how it helps with rendering performance, and how it compares to display and visibility properties. However, content-visibility operates differently than those do. It is somewhat similar to display and visibility properties that already exist. Essentially, this property changes the visibility of an element and manages its render state. Influencing browser rendering processes is now even easier to do, thanks to the new CSS content-visibility property. There are direct and indirect ways to help browsers render our content more efficiently.The results of rendering performance are incredibly apparent in mobile devices, especially the lower end ones.It is a blocking operation, therefore it blocks all user interactions Rendering is an integral part of how modern websites work.However, developers should focus on rendering for three primary reasons: Also, rendering is an internal process of browsers that web developers do not have direct access to. Using CSS content-visibility to boost your rendering performanceĭevelopers don’t typically prioritize rendering performance when they aim to improve and optimize their websites.Īfter all, there are other optimizations such as improving server response times, reducing file sizes, and prioritizing the file loads that provide immediate visible improvement. I build scalable, maintainable, performant frontends and backends. ![]() ![]() Popup also redefines the default value to be Collapsed, with similar resulting behavior for Popup and its derived classes.Ozan Tunca Follow I'm a senior software engineer working mainly with JavaScript (read: TypeScript). This has the effect of not running the Measure pass of layout on an initially created Window, and RenderSize returns (0,0). When inherited by Window or its derived classes, Window redefines the default value of this property to be Collapsed. However, IsVisible has other factors that influence it, for instance the visibility settings of parents that contain it.Įlements where Visibility is not Visible do not participate in input events (or commands), do not influence either the Measure or Arrange passes of layout, are not in a tab sequence, and will not be reported in hit testing. Setting this property affects the value of IsVisible, which in turn may raise the IsVisibleChanged event. Private Sub PlayMedia(ByVal sender As Object, ByVal args As MouseButtonEventArgs) PlayBTN.Visibility = Visibility.Collapsed PauseBTN.Visibility = Visibility.Visible private void PlayMedia(object sender, MouseButtonEventArgs args) Prior to running the actual program logic associated with the button, the button itself is set to be Visibility.Hidden, and the other button in the pair is set to Visibility.Visible. ![]() The following example implements a handler that references two different named buttons that are intended to be a mutually exclusive pair in the user interface. ![]()
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