'How to hide image's alt tag when you reload the page with lazyload?

I am using lazyload to display my images in my website (with data-src instead of src).

However, when you reload the page, you can see the alt tag appear (during 0.1s during the loading). I saw some similar questions, but not exactly helpful because nothing works for me, for example like this class:

 img:-moz-loading {
  visibility: hidden;
}

There is a way to hide the alt tag and the little picture enter image description here (without removing the tag) during the reload of the page ?

The alt tag should only appear if the image doesn't exist at the end of the load

Thank you,

htmlcsslazy-loading


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