KITFORMA · EDITORIAL ANSWER
Why does opening a filter panel submit the surrounding HTML form?
KitForma editorial guide. A button associated with a form defaults to submit behavior unless its type says otherwise.
Step-by-step answer
type="button" and reserve type="submit" for submission. Inspect the actual rendered element because a component library may omit the attribute. Verify clicking the filter and pressing Enter in a text field separately; canceling every form submit event can conceal the wrong button semantics and break keyboard submission.Sources and verification
Sources checked:
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