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Test Info:

const cases = {
internal: '<script>window.internalScript = true;</script>',
external: '<script src="externalScript.js"></script>',
};
const loaded = new Promise(resolve => {
window.addEventListener('load', resolve);
});
Object.entries(cases).forEach(([k, v]) => {
const xsltSrc = `<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" encoding="utf-8" version="5"/>
<xsl:template match="/">
<section>
${v}
</section>
</xsl:template>
</xsl:stylesheet>`;
const processor = new XSLTProcessor();
const parser = new DOMParser();
processor.importStylesheet(
parser.parseFromString(xsltSrc, 'application/xml')
);
document.body.appendChild(
processor.transformToFragment(
parser.parseFromString('<x/>', 'application/xml'),
document
)
);
promise_test(async () => {
await loaded;
assert_true(
window[`${k}Script`],
'script element from XSLTProcessor.transformToFragment() is evaluated'
);
}, `${k} script`);
})