What does `% s` mean in JavaScript?

What does s mean in

JavaScript? For example, there is this in the following code:

metaInfo: {
        title: "",
        titleTemplate: "%s - Hello",
        meta: [
            {name: "keywords", content: ""},
            {name: "description", content: ""}
        ]
    }
May.22,2021

has nothing to do with js , this is the package own convention, similar to ${title}-Hello .

Source code getMetaInfo.js-sharpL155

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