<!DOCTYPE html>
<script>
    function textFieldContainsSpace()
    {
        return document.querySelector("input").value === " ";
    }

    function blurTextField()
    {
        document.querySelector("input").blur();
    }

    function isDocumentScrolled()
    {
        return scrollY !== 0;
    }

    function loaded()
    {
        document.querySelector("input").focus();
    }

    addEventListener("load", loaded);
</script>
<input>
<div style="height: 3000px;"></div>