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Test Info:

/* Any copyright is dedicated to the Public Domain.
"use strict";
// Test that editing a rule will update the line numbers of subsequent
// rules in the rule view.
const TESTCASE_URI = URL_ROOT + "doc_keyframeLineNumbers.html";
add_task(async function () {
await addTab(TESTCASE_URI);
const { inspector, view } = await openRuleView();
await selectNode("#outer", inspector);
info("Insert a new property, which will affect the line numbers");
await addProperty(view, 1, "font-size", "72px");
await selectNode("#inner", inspector);
const value = getRuleViewLinkTextByIndex(view, 3);
// Note that this is relative to the <style>.
is(value.slice(-3), ":27", "rule line number is 27");
});