HTML5 export error

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:bust_in_silhouette: Asked By Huti

Hi. I have a problem with this texture. Clouds coming down. There is a code for that. Everything works fine until I export to Html5. Then the clouds disappear and there is only a blue background.

shader_type canvas_item;

uniform float scroll_speed;

void fragment() {
 vec2 u = UV;
 u.y -= scroll_speed*TIME;
 vec4 col = texture(TEXTURE,u);
 COLOR = col;
}