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+using System.Linq;
+using HtmlRenderer.IntegrationTest.TestSupport;
+
+namespace HtmlRenderer.IntegrationTest.Text;
+
+/// <summary>
+/// CSS 2.1 §16.1 (<c>text-indent</c>) and §16.4 (<c>word-spacing</c>) layout coverage - both properties were
+/// already fully implemented (unlike <c>letter-spacing</c>, which this port found has zero layout wiring at
+/// all - see remarks below), just untested at the layout level (only CSS-OM parsing existed). Ported/adapted
+/// from PeachPDF's TextIndentLayoutIntegrationTests.cs/LetterWordSpacingLayoutIntegrationTests.cs, restricted
+/// to the CSS 2.1 subset: a single <c>text-indent</c> length applied to a block's first line only (no
+/// <c>hanging</c>/<c>each-line</c> - CSS Text Level 4 - and no RTL-specific cases, since this fork's
+/// text-indent implementation is the plain CSS2.1 one).
+/// </summary>
+/// <remarks>
+/// <c>letter-spacing</c> is a confirmed, real gap found while porting this file: it parses fine
+/// (<c>CSS/FontKeywordPropertyTests.cs</c>) but has zero wiring anywhere in <c>Core</c> - no
+/// <c>CssBoxProperties.LetterSpacing</c> field, and no case in <c>CssUtils.GetPropertyValue</c>/
+/// <c>SetPropertyValue</c>/<c>_knownPropertyNames</c> (confirmed by grep - contrast with <c>word-spacing</c>,
+/// which has all of these). Implementing it is a real, separate word-measurement change (not a small
+/// backport - PeachPDF's own fix touched word-box-width reservation, inter-word-gap collapse prevention, and
+/// adjacent-inline-run overlap, per that file's own remarks) and is out of scope for this pass; flagged as a
+/// follow-up rather than built here.
+/// <para>
+/// A second, more fundamental gap this file's own tests found: <c>word-spacing</c>, however it's set
+/// (directly on the text-owning block, or on an ancestor further up - both fail identically), never
+/// actually reaches the inter-word gap for plain adjacent words in normal text flow. Root cause, confirmed
+/// by direct inspection: the CssRectWord that owns each word is an anonymous child text box, and that
+/// anonymous child's own <c>WordSpacing</c> reads back "normal" regardless of what any ancestor - including
+/// the direct parent - has set, so <c>CssRect.FullWidth</c>'s <c>OwnerBox.ActualWordSpacing</c> term is
+/// always the unspaced default. (<c>CssLayoutEngine.cs</c> has two call sites that DO add
+/// <c>ActualWordSpacing</c> correctly - for a stray whitespace-only box between two separately-styled
+/// inline elements - plus a third, commented-out block that looks like an abandoned attempt at exactly
+/// this normal-adjacent-word case.) Not fixed here - the anonymous text-box creation/inheritance path
+/// (<c>CorrectTextBoxes</c> et al. in <c>Parse/DomParser.cs</c>) is a shared, high-traffic piece of the
+/// engine, and root-causing this precisely was out of this pass's budget.
+/// </para>
+/// </remarks>
+[DoNotParallelize]
+[TestClass]
+public sealed class TextSpacingAndIndentLayoutIntegrationTests
+{
+    [Ignore("word-spacing set directly on the block that owns the words has no effect - see this class's own " +
+            "remarks for the root cause (the anonymous text child that actually owns the words doesn't inherit " +
+            "its own parent's directly-set word-spacing, confirmed by direct inspection: the child's own " +
+            "WordSpacing reads back \"normal\").")]
+    [TestMethod]
+    public void WordSpacing_IncreasesGapBetweenAdjacentWords()
+    {
+        var spacedGap = InterWordGap("<p id='p' style='word-spacing:10px'>AA BB</p>");
+        var plainGap = InterWordGap("<p id='p'>AA BB</p>");
+
+        Assert.AreEqual(plainGap + 10, spacedGap, 1);
+    }
+
+    [Ignore("Same root cause as WordSpacing_IncreasesGapBetweenAdjacentWords above, and fails identically " +
+            "whether word-spacing is set directly on the text-owning block or (as here) an ancestor further " +
+            "up - see this class's own remarks.")]
+    [TestMethod]
+    public void WordSpacing_OnAncestor_AffectsDescendantGap()
+    {
+        var spacedGap = InterWordGap("<div style='word-spacing:10px'><p id='p'>AA BB</p></div>");
+        var plainGap = InterWordGap("<p id='p'>AA BB</p>");
+
+        Assert.AreEqual(plainGap + 10, spacedGap, 1);
+    }
+
+    [TestMethod]
+    public void WordSpacingNormal_LeavesGapUnchanged()
+    {
+        var normalGap = InterWordGap("<p id='p' style='word-spacing:normal'>AA BB</p>");
+        var plainGap = InterWordGap("<p id='p'>AA BB</p>");
+
+        Assert.AreEqual(plainGap, normalGap, 1);
+    }
+
+    [Ignore("Same root cause as WordSpacing_IncreasesGapBetweenAdjacentWords above - word-spacing set " +
+            "directly on the text-owning block has no effect.")]
+    [TestMethod]
+    public void WordSpacingNegative_ReducesGap()
+    {
+        var negativeGap = InterWordGap("<p id='p' style='word-spacing:-5px'>AA BB</p>");
+        var plainGap = InterWordGap("<p id='p'>AA BB</p>");
+
+        Assert.AreEqual(plainGap - 5, negativeGap, 1);
+    }
+
+    [TestMethod]
+    public void TextIndent_IndentsOnlyTheFirstLine()
+    {
+        var html = LayoutHarness.Wrap(
+            "<p id='p' style='width:120px; text-indent:40px; margin:0;'>"
+            + "This text is long enough that it wraps onto a second line for sure.</p>");
+        var (root, _) = LayoutHarness.Layout(html);
+        var p = LayoutHarness.FindById(root, "p")!;
+
+        var wordsByLine = AllWords(p).GroupBy(w => w.Top).OrderBy(g => g.Key).ToList();
+        Assert.IsTrue(wordsByLine.Count >= 2, "fixture text should wrap onto at least two lines");
+
+        var firstLineLeft = wordsByLine[0].Min(w => w.Left);
+        var secondLineLeft = wordsByLine[1].Min(w => w.Left);
+
+        Assert.AreEqual(40, firstLineLeft, 1);
+        Assert.AreEqual(0, secondLineLeft, 1);
+    }
+
+    [TestMethod]
+    public void TextIndentZero_NoIndentOnAnyLine()
+    {
+        var html = LayoutHarness.Wrap("<p id='p' style='margin:0;'>Hello world</p>");
+        var (root, _) = LayoutHarness.Layout(html);
+        var p = LayoutHarness.FindById(root, "p")!;
+
+        var firstWord = AllWords(p).OrderBy(w => w.Left).First();
+        Assert.AreEqual(0, firstWord.Left, 1);
+    }
+
+    // ── Helpers ────────────────────────────────────────────────────────────
+
+    private static double InterWordGap(string bodyHtml)
+    {
+        var html = LayoutHarness.Wrap(bodyHtml);
+        var (root, _) = LayoutHarness.Layout(html);
+        var p = LayoutHarness.FindById(root, "p")!;
+        var words = AllWords(p).OrderBy(w => w.Left).ToList();
+
+        Assert.AreEqual(2, words.Count);
+        return words[1].Left - (words[0].Left + words[0].Width);
+    }
+
+    private static System.Collections.Generic.IEnumerable<TheArtOfDev.HtmlRenderer.Core.Dom.CssRect> AllWords(
+        TheArtOfDev.HtmlRenderer.Core.Dom.CssBox box)
+    {
+        foreach (var word in box.Words) yield return word;
+        foreach (var child in box.Boxes)
+        {
+            foreach (var word in AllWords(child)) yield return word;
+        }
+    }
+}