diff --git a/ChangeLog b/ChangeLog
index 107d29f5..b8cbf96d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -14,6 +14,9 @@
 
 ## Interface and handling
 
+- isolate real-browser numerical fixtures from editable GUI examples and keep
+  CSV export checks synchronized with selected columns and seed-end defaults
+
 - integrate CopomuS as the browser Mutation Design task with single-pair input,
   native controls, extended tables and four-state vaRRI visualization (#307)
 
@@ -23,9 +26,6 @@
 - fix CopomuS explicit mutations, GC filters, signed indices, zero scores and
   shared profiles; validate inputs and preserve output on failure (PR #298)
 
-- isolate real-browser numerical fixtures from editable GUI examples and cover
-  the complete prediction seed-coordinate CSV defaults (#310)
-
 - --outNumberPerSeed selects each seed's best candidate sites before final
   deduplication, energy/overlap/count filtering; model P ranks left-most-anchor
   ensembles; zero preserves ordinary prediction; the GUI exposes the quota next
@@ -341,8 +341,9 @@ energies, restricted partition sums, and trackers.
  * scripts/wasm/test-browser.py
    * Stop loading editable GUI examples as numerical browser-test fixtures; seed
      prediction, evaluation and mutation checks from explicit test-only inputs.
-   * Expect both seed start and end coordinates in the prediction CSV defaults,
-     restoring the WASM browser workflow after the GUI default changed (#310).
+   * Derive the expected CSV download header from the rendered result columns and
+     verify both seed boundaries, restoring the master WebAssembly workflow after
+     the GUI default changed.
 
 261026 Alexander Mitrofanov
  * gui/{index.html,app.js,styles.css,copomus*.js,runner.js,sessions.js},
diff --git a/scripts/wasm/test-browser.py b/scripts/wasm/test-browser.py
index 436137dd..ff2fbe38 100644
--- a/scripts/wasm/test-browser.py
+++ b/scripts/wasm/test-browser.py
@@ -344,7 +344,11 @@ def predict():
     with page.expect_download() as downloaded:
         active.locator('[data-role=download]').click()
     csv = Path(downloaded.value.path()).read_text()
-    assert csv.splitlines()[0] == 'id1;start1;end1;id2;start2;end2;subseqDP;hybridDP;E;ED1;ED2;seedE;seedStart1;seedEnd1;seedStart2;seedEnd2'
+    result_columns = active.locator('[data-role=visible-columns] input').evaluate_all(
+        "inputs => inputs.map(input => input.value).filter(value => value !== 'deltaE')"
+    )
+    assert result_columns[-4:] == ['seedStart1', 'seedEnd1', 'seedStart2', 'seedEnd2']
+    assert csv.splitlines()[0].split(';') == result_columns
     assert 'target;1;10;query;1;10;' in csv
     assert 'deltaE' not in csv
     assert active.locator('thead th').first.inner_text() == ''