├── LICENSE
├── README.md
├── css-aspect-ratio.css
└── package.json
/LICENSE:
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/README.md:
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1 | # CSS Aspect Ratio
2 |
3 | This package provides a simple implementation of fixed aspect ratio in pure CSS.
4 | It requires support for [CSS Custom Properties](https://www.w3.org/TR/css-variables-1/).
5 |
6 | Modular implementation approach adapted from
7 | https://sgom.es/posts/2017-02-17-css-custom-properties-as-your-api/
8 |
9 | CSS-only aspect ratio trick adapted from
10 | https://alistapart.com/article/creating-intrinsic-ratios-for-video
11 |
12 |
13 | ## Rationale / background
14 |
15 | A common problem is how to avoid content shifting down as images load. This is usually solved by
16 | adding the height and width of an image in HTML, so that the browser can allocate enough space
17 | for the content ahead of time.
18 |
19 | ```html
20 | 
21 | ```
22 |
23 | However, if you want to adjust the dimensions for the image in CSS (say, by applying a `max-width`
24 | to the image), you lose the ability to maintain the aspect ratio. Instead, the width and height
25 | get applied separately, and the image gets deformed.
26 |
27 | This package allows you to specify the width and have the height calculated automatically,
28 | ensuring that the aspect ratio is maintained even if the image is resized.
29 |
30 | It's also generic enough to be applied to any block, not just images.
31 |
32 |
33 | ## Install
34 |
35 | ```sh
36 | npm i --save-dev css-aspect-ratio
37 | ```
38 |
39 |
40 | ## Import
41 |
42 | ### Sass
43 |
44 | In Sass, first make sure `node_modules` is in your `includePaths`. Then:
45 |
46 | ```scss
47 | @import "css-aspect-ratio/css-aspect-ratio";
48 | ```
49 |
50 | ### Less
51 |
52 | In Less, install `less-plugin-npm-import` and do:
53 |
54 | ```less
55 | @import (inline) "npm://css-aspect-ratio/css-aspect-ratio.css";
56 | ```
57 |
58 | ### Plain CSS
59 |
60 | In plain CSS, make sure you use a bundler or build tool to copy dependencies. To import:
61 |
62 | `@import /path/to/css-aspect-ratio.css;`
63 |
64 | You can also use unpkg as a CDN:
65 |
66 | ```css
67 | @import https://unpkg.com/css-aspect-ratio@1/css-aspect-ratio.css;
68 | ```
69 |
70 |
71 | ## Usage
72 |
73 | In HTML:
74 |
75 | ```html
76 |
78 |
79 |
80 |