Constant required_extensions

pub const required_extensions: AttributeDescription;

https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/requiredExtensions

Usage in rsx

let required_extensions = "value";

rsx! {
    // Attributes need to be under the element they modify
    div {
        // Attributes are followed by a colon and then the value of the attribute
        required_extensions: "value"
    }
    div {
        // Or you can use the shorthand syntax if you have a variable in scope that has the same name as the attribute
        required_extensions,
    }
};