caught DOMException: Failed to execute ‘btoa’ on ‘Window’: The string to be encoded contains characters outside of the Latin1 range.

caught DOMException: Failed to execute ‘btoa’ on ‘Window’: The string to be encoded contains characters outside of the Latin1 range.
のエラーが出る場合、日本語文字が入っているから

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エラー）
console.log( btoa( ‘あいうえお’) );

正）
console.log( btoa( unescape ( encodeURIComponent(‘あいうえお’) ) ) );

SVG出力などでも同じ