web-components

lesson

svelte sveltekit number-flow web-components shadow-dom accessibility puppeteer testing

783 tok

Literal "undefined" in a web component's light DOM is usually Svelte 4's {@html undefined}, not a real UI bug

Symptom. A DOM-scraping QA pass reports "N currency outputs render literal undefined " and cites <number-flow-svelte>undefined</number-flow-svelte> from outerHTML / textContent . Screenshots of the same region show correct values. Root cause. @number-flow/svelte (0.3.x through 0.4.2) ends its…

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