2019-11-30
2131
#css
Craig Buckler
10539
Nov 30, 2019 â‹… 7 min read

Jank-free page loading with media aspect ratios

Craig Buckler Freelance UK IT consultant specializing in HTML5 webby stuff.

Recent posts:

master state management hydration Nuxt usestate

Nuxt state management and hydration with useState

useState can effectively replace ref in many scenarios and prevent Nuxt hydration mismatches that can lead to unexpected behavior and errors.

Yan Sun
Jan 20, 2025 â‹… 8 min read
React Native List Components: FlashList, FlatList, And More

React Native list components: FlashList, FlatList, and more

Explore the evolution of list components in React Native, from `ScrollView`, `FlatList`, `SectionList`, to the recent `FlashList`.

Chimezie Innocent
Jan 16, 2025 â‹… 4 min read
Building An AI Agent For Your Frontend Project

Building an AI agent for your frontend project

Explore the benefits of building your own AI agent from scratch using Langbase, BaseUI, and Open AI, in a demo Next.js project.

Ivaylo Gerchev
Jan 15, 2025 â‹… 12 min read
building UI sixty seconds shadcn framer ai

Building a UI in 60 seconds with Shadcn and Framer AI

Demand for faster UI development is skyrocketing. Explore how to use Shadcn and Framer AI to quickly create UI components.

Peter Aideloje
Jan 14, 2025 â‹… 6 min read
View all posts

3 Replies to "Jank-free page loading with media aspect ratios"

  1. This is great but I am struggling here a bit. For example. On my photo hosting site, I display a random selection of images. These are shown as thumbnails. See here:

    https://www.ag2si.com/gallerysoft/

    What I am having difficulty with understanding is the following:
    I created the site as responsive, so when you grow or shrink the browser, the thumbnails grow and shrink as well.
    I know the aspect ratio of the original image.
    I use flex and specify something like so
    flex:${aspect};
    However, since the page is dynamic in size, I do not know what size the thumbnails will be. Therefore, I cannot add the width and height attributes to the src tag. And a pagespeed web dev site recommends I should include them.

    Does that make sense?

    Thanks
    JT

  2. You set the width and height of the original image – not the dimensions it’ll be displayed at.

    So a 600×450 image has width=”600″ height=”450″ regardless of how it appears on the page. The browser will calculate it’s aspect ratio so, if the resulting image width is 300px, it’ll reserve 225px of vertical space before the image has started to load.

    Therefore, width=”4″ height=”3″ and width=”8000″ height=”6000″ would act identically – they’re all the same aspect ratio.

Leave a Reply