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Diffstat (limited to 'doc/development/fe_guide/performance.md')
| -rw-r--r-- | doc/development/fe_guide/performance.md | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/doc/development/fe_guide/performance.md b/doc/development/fe_guide/performance.md index f25313d6cff..14ac1133cc0 100644 --- a/doc/development/fe_guide/performance.md +++ b/doc/development/fe_guide/performance.md @@ -29,11 +29,12 @@ To improve the time to first render we are using lazy loading for images. This w the actual image source on the `data-src` attribute. After the HTML is rendered and JavaScript is loaded, the value of `data-src` will be moved to `src` automatically if the image is in the current viewport. -* Prepare images in HTML for lazy loading by renaming the `src` attribute to `data-src` +* Prepare images in HTML for lazy loading by renaming the `src` attribute to `data-src` AND adding the class `lazy` * If you are using the Rails `image_tag` helper, all images will be lazy-loaded by default unless `lazy: false` is provided. If you are asynchronously adding content which contains lazy images then you need to call the function -`gl.lazyLoader.searchLazyImages()` which will search for lazy images and load them if needed. +`gl.lazyLoader.searchLazyImages()` which will search for lazy images and load them if needed. +But in general it should be handled automatically through a `MutationObserver` in the lazy loading function. ## Reducing Asset Footprint |