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# Deprecate lazySizes (`DeprecateLazysizes`) [lazysizes](https://github.com/aFarkas/lazysizes) is a common JavaScript library used to lazy load images, iframes and scripts. ## Check Details This check is aimed at discouraging the use of the lazysizes JavaScript library :-1: Examples of **incorrect** code for this check: ```liquid <!-- Reports use of "data-srcset" and "data-sizes" attribute. Reports data-sizes="auto" --> <img alt="House by the lake" data-sizes="auto" data-srcset="small.jpg 500w, medium.jpg 640w, big.jpg 1024w" data-src="medium.jpg" class="lazyload" /> ``` :+1: Examples of **correct** code for this check: ```liquid <!-- Does not use lazySizes library. Instead uses native "loading" attribute --> <img src="a.jpg" loading="lazy"> ``` ## Check Options The default configuration for this check is the following: ```yaml DeprecateLazysizes: enabled: true ``` ## When Not To Use It You should disable this rule if you want to support lazy loading of images in older browser that don't support the loading="lazy" attribute yet. ## Version This check has been introduced in Theme Check 1.0.0. ## Resources - [Rule Source][codesource] - [Documentation Source][docsource] [codesource]: /lib/theme_check/checks/deprecate_lazysizes.rb [docsource]: /docs/checks/deprecate_lazysizes.md
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24 entries across 24 versions & 1 rubygems