[emmanuelbruno]

Why

%%sqlAsTable emits its default HTML output as <table border=1 style="border-collapse:collapse; width:100%;"> via display_data. Quarto 1.10.18's notebook-output pandoc pass neuters kernel-HTML table attributes: border becomes an inert data-border="1", inline style is dropped — so the tables render borderless on custom themes. Probe-verified on the ebpro render image (Quarto 1.10.18): custom class and data-* attributes survive the neutering.

Consumers today anchor the fragile table[data-border="1"] selector (a pandoc-mutated artifact). This PR gives them a stable, intentional hook.

Change

Add class="ijava-db-table" to both <table …> opening tags emitted by the sqlAsTable default-HTML path in JavaDBMSMagics.java (L559 and L626 — the two result-set render branches). border and style are kept as-is for backward compatibility: existing data-border="1" CSS anchors keep working unchanged.

-html.append("<table border=1 style=\"border-collapse:collapse; width:100%;\">\n<thead><tr>");
+html.append("<table class=\"ijava-db-table\" border=1 style=\"border-collapse:collapse; width:100%;\">\n<thead><tr>");

Downstream plan (ebpro consumer side)

• Fleet lesson CSS switches from the table[data-border="1"] anchor to .ijava-db-table as the primary hook; the data-border anchor is retained belt-and-braces for jars predating this change.
• Affected surface today: ebpro lab lab-quarto-lookandfeel lesson 07 (3 DB tables rendered via %%sqlAsTable).

Verification

• ./gradlew compileJava compileTestJava — green (Temurin JDK 25, Gradle 9.7.1).
• ./gradlew :test --tests 'io.github.spencerpark.ijava.magics.*' — green; existing JavaDBMSMagicsTest asserts on contains("<table"), unaffected by the added attribute.

Base note

Branches from chore/build-correctness (tip = tag v1.4.6-pr12, the lineage that produces the shipped IJava-v1.4.6-pr12.jar). master predates the %%sqlAsTable/%%rdbmsSchema magics entirely, so it cannot host this change.