.... They make you break your HTML by removing the src attribute, or make you put tiny version there or make you use <noscript> to make your images appear in Google Images. The lazy loading works in browsers supporting the srcset attribute. As of December 2017 that's 86.78%. Unsupported browsers will load the image in the src attribute. That's the image search engines and social networks will find, so it's better to make it high-resolution.