diff --git a/xfa/fxfa/cxfa_ffbarcode.cpp b/xfa/fxfa/cxfa_ffbarcode.cpp
index 32811e7d..72b2f08 100644
--- a/xfa/fxfa/cxfa_ffbarcode.cpp
+++ b/xfa/fxfa/cxfa_ffbarcode.cpp
@@ -9,6 +9,7 @@
 #include <utility>
 
 #include "core/fxcrt/fx_extension.h"
+#include "third_party/base/check.h"
 #include "xfa/fwl/cfwl_app.h"
 #include "xfa/fwl/cfwl_barcode.h"
 #include "xfa/fwl/cfwl_notedriver.h"
@@ -143,7 +144,7 @@
 }
 
 bool CXFA_FFBarcode::LoadWidget() {
-  ASSERT(!IsLoaded());
+  DCHECK(!IsLoaded());
 
   CFWL_Barcode* pFWLBarcode = cppgc::MakeGarbageCollected<CFWL_Barcode>(
       GetFWLApp()->GetHeap()->GetAllocationHandle(), GetFWLApp());
diff --git a/xfa/fxfa/cxfa_ffcheckbutton.cpp b/xfa/fxfa/cxfa_ffcheckbutton.cpp
index 75eca3a..05319c6 100644
--- a/xfa/fxfa/cxfa_ffcheckbutton.cpp
+++ b/xfa/fxfa/cxfa_ffcheckbutton.cpp
@@ -6,6 +6,7 @@
 
 #include "xfa/fxfa/cxfa_ffcheckbutton.h"
 
+#include "third_party/base/check.h"
 #include "v8/include/cppgc/visitor.h"
 #include "xfa/fwl/cfwl_checkbox.h"
 #include "xfa/fwl/cfwl_messagemouse.h"
@@ -36,7 +37,7 @@
 }
 
 bool CXFA_FFCheckButton::LoadWidget() {
-  ASSERT(!IsLoaded());
+  DCHECK(!IsLoaded());
 
   CFWL_CheckBox* pCheckBox = cppgc::MakeGarbageCollected<CFWL_CheckBox>(
       GetFWLApp()->GetHeap()->GetAllocationHandle(), GetFWLApp());
diff --git a/xfa/fxfa/cxfa_ffcombobox.cpp b/xfa/fxfa/cxfa_ffcombobox.cpp
index 1e9feaa..23cdaf0 100644
--- a/xfa/fxfa/cxfa_ffcombobox.cpp
+++ b/xfa/fxfa/cxfa_ffcombobox.cpp
@@ -9,6 +9,7 @@
 #include <utility>
 #include <vector>
 
+#include "third_party/base/check.h"
 #include "v8/include/cppgc/visitor.h"
 #include "xfa/fwl/cfwl_combobox.h"
 #include "xfa/fwl/cfwl_eventselectchanged.h"
@@ -54,7 +55,7 @@
 }
 
 bool CXFA_FFComboBox::LoadWidget() {
-  ASSERT(!IsLoaded());
+  DCHECK(!IsLoaded());
 
   CFWL_ComboBox* pComboBox = cppgc::MakeGarbageCollected<CFWL_ComboBox>(
       GetFWLApp()->GetHeap()->GetAllocationHandle(), GetFWLApp());
diff --git a/xfa/fxfa/cxfa_ffdatetimeedit.cpp b/xfa/fxfa/cxfa_ffdatetimeedit.cpp
index bca9b88..ebd3861 100644
--- a/xfa/fxfa/cxfa_ffdatetimeedit.cpp
+++ b/xfa/fxfa/cxfa_ffdatetimeedit.cpp
@@ -6,6 +6,7 @@
 
 #include "xfa/fxfa/cxfa_ffdatetimeedit.h"
 
+#include "third_party/base/check.h"
 #include "xfa/fwl/cfwl_datetimepicker.h"
 #include "xfa/fwl/cfwl_eventselectchanged.h"
 #include "xfa/fwl/cfwl_notedriver.h"
@@ -39,7 +40,7 @@
 }
 
 bool CXFA_FFDateTimeEdit::LoadWidget() {
-  ASSERT(!IsLoaded());
+  DCHECK(!IsLoaded());
 
   CFWL_DateTimePicker* pWidget =
       cppgc::MakeGarbageCollected<CFWL_DateTimePicker>(
diff --git a/xfa/fxfa/cxfa_ffdoc.cpp b/xfa/fxfa/cxfa_ffdoc.cpp
index 4ab61d6..54d17f7 100644
--- a/xfa/fxfa/cxfa_ffdoc.cpp
+++ b/xfa/fxfa/cxfa_ffdoc.cpp
@@ -22,6 +22,7 @@
 #include "core/fxcrt/xml/cfx_xmlparser.h"
 #include "core/fxge/dib/cfx_dibitmap.h"
 #include "fxjs/xfa/cjx_object.h"
+#include "third_party/base/check.h"
 #include "third_party/base/ptr_util.h"
 #include "v8/include/cppgc/allocation.h"
 #include "v8/include/cppgc/heap.h"
@@ -309,7 +310,7 @@
 
 bool CXFA_FFDoc::SavePackage(CXFA_Node* pNode,
                              const RetainPtr<IFX_SeekableStream>& pFile) {
-  ASSERT(pNode || GetXFADoc()->GetRoot());
+  DCHECK(pNode || GetXFADoc()->GetRoot());
 
   CXFA_DataExporter exporter;
   return exporter.Export(pFile, pNode ? pNode : GetXFADoc()->GetRoot());
diff --git a/xfa/fxfa/cxfa_ffdocview.cpp b/xfa/fxfa/cxfa_ffdocview.cpp
index 1c4d5f4..dd88653 100644
--- a/xfa/fxfa/cxfa_ffdocview.cpp
+++ b/xfa/fxfa/cxfa_ffdocview.cpp
@@ -13,6 +13,7 @@
 #include "fxjs/gc/container_trace.h"
 #include "fxjs/xfa/cfxjse_engine.h"
 #include "fxjs/xfa/cjx_object.h"
+#include "third_party/base/check.h"
 #include "third_party/base/stl_util.h"
 #include "xfa/fxfa/cxfa_ffapp.h"
 #include "xfa/fxfa/cxfa_ffbarcode.h"
@@ -506,7 +507,7 @@
 }
 
 void CXFA_FFDocView::AddIndexChangedSubform(CXFA_Node* pNode) {
-  ASSERT(pNode->GetElementType() == XFA_Element::Subform);
+  DCHECK(pNode->GetElementType() == XFA_Element::Subform);
   if (!pdfium::Contains(m_IndexChangedSubforms, pNode))
     m_IndexChangedSubforms.push_back(pNode);
 }
diff --git a/xfa/fxfa/cxfa_fffield.cpp b/xfa/fxfa/cxfa_fffield.cpp
index 6002cb8..8cb363c 100644
--- a/xfa/fxfa/cxfa_fffield.cpp
+++ b/xfa/fxfa/cxfa_fffield.cpp
@@ -9,6 +9,7 @@
 #include <algorithm>
 #include <utility>
 
+#include "third_party/base/check.h"
 #include "third_party/base/stl_util.h"
 #include "xfa/fwl/cfwl_edit.h"
 #include "xfa/fwl/cfwl_eventmouse.h"
@@ -711,7 +712,7 @@
 }
 
 void CXFA_FFField::SendMessageToFWLWidget(CFWL_Message* pMessage) {
-  ASSERT(pMessage);
+  DCHECK(pMessage);
   GetApp()->GetFWLWidgetMgr()->OnProcessMessageToForm(pMessage);
 }
 
diff --git a/xfa/fxfa/cxfa_ffimageedit.cpp b/xfa/fxfa/cxfa_ffimageedit.cpp
index a3d70fc..b70bc1a 100644
--- a/xfa/fxfa/cxfa_ffimageedit.cpp
+++ b/xfa/fxfa/cxfa_ffimageedit.cpp
@@ -7,6 +7,7 @@
 #include "xfa/fxfa/cxfa_ffimageedit.h"
 
 #include "core/fxge/dib/cfx_dibitmap.h"
+#include "third_party/base/check.h"
 #include "v8/include/cppgc/visitor.h"
 #include "xfa/fwl/cfwl_app.h"
 #include "xfa/fwl/cfwl_messagemouse.h"
@@ -37,7 +38,7 @@
 }
 
 bool CXFA_FFImageEdit::LoadWidget() {
-  ASSERT(!IsLoaded());
+  DCHECK(!IsLoaded());
 
   CFWL_PictureBox* pPictureBox = cppgc::MakeGarbageCollected<CFWL_PictureBox>(
       GetFWLApp()->GetHeap()->GetAllocationHandle(), GetFWLApp());
diff --git a/xfa/fxfa/cxfa_fflistbox.cpp b/xfa/fxfa/cxfa_fflistbox.cpp
index 039f389..9505063 100644
--- a/xfa/fxfa/cxfa_fflistbox.cpp
+++ b/xfa/fxfa/cxfa_fflistbox.cpp
@@ -10,6 +10,7 @@
 #include <utility>
 #include <vector>
 
+#include "third_party/base/check.h"
 #include "third_party/base/stl_util.h"
 #include "v8/include/cppgc/visitor.h"
 #include "xfa/fwl/cfwl_listbox.h"
@@ -45,7 +46,7 @@
 }
 
 bool CXFA_FFListBox::LoadWidget() {
-  ASSERT(!IsLoaded());
+  DCHECK(!IsLoaded());
 
   CFWL_ListBox* pListBox = cppgc::MakeGarbageCollected<CFWL_ListBox>(
       GetFWLApp()->GetHeap()->GetAllocationHandle(), GetFWLApp(),
diff --git a/xfa/fxfa/cxfa_ffnotify.cpp b/xfa/fxfa/cxfa_ffnotify.cpp
index be1ce9e..d5238c6 100644
--- a/xfa/fxfa/cxfa_ffnotify.cpp
+++ b/xfa/fxfa/cxfa_ffnotify.cpp
@@ -8,6 +8,7 @@
 
 #include <utility>
 
+#include "third_party/base/check.h"
 #include "xfa/fxfa/cxfa_ffapp.h"
 #include "xfa/fxfa/cxfa_ffarc.h"
 #include "xfa/fxfa/cxfa_ffbarcode.h"
@@ -93,8 +94,8 @@
 }
 
 CXFA_FFWidget* CXFA_FFNotify::OnCreateContentLayoutItem(CXFA_Node* pNode) {
-  ASSERT(pNode->GetElementType() != XFA_Element::ContentArea);
-  ASSERT(pNode->GetElementType() != XFA_Element::PageArea);
+  DCHECK(pNode->GetElementType() != XFA_Element::ContentArea);
+  DCHECK(pNode->GetElementType() != XFA_Element::PageArea);
 
   // We only need to create the widget for certain types of objects.
   if (!pNode->HasCreatedUIWidget())
@@ -203,7 +204,6 @@
     case XFA_FFWidgetType::kNone:
       return nullptr;
   }
-  ASSERT(pWidget);
   auto* pLayout = CXFA_LayoutProcessor::FromDocument(m_pDoc->GetXFADoc());
   pWidget->SetDocView(m_pDoc->GetDocView(pLayout));
   return pWidget;
diff --git a/xfa/fxfa/cxfa_ffnumericedit.cpp b/xfa/fxfa/cxfa_ffnumericedit.cpp
index c350d34..8ab4cf9 100644
--- a/xfa/fxfa/cxfa_ffnumericedit.cpp
+++ b/xfa/fxfa/cxfa_ffnumericedit.cpp
@@ -6,6 +6,7 @@
 
 #include "xfa/fxfa/cxfa_ffnumericedit.h"
 
+#include "third_party/base/check.h"
 #include "xfa/fwl/cfwl_edit.h"
 #include "xfa/fwl/cfwl_eventvalidate.h"
 #include "xfa/fwl/cfwl_notedriver.h"
@@ -20,7 +21,7 @@
 CXFA_FFNumericEdit::~CXFA_FFNumericEdit() = default;
 
 bool CXFA_FFNumericEdit::LoadWidget() {
-  ASSERT(!IsLoaded());
+  DCHECK(!IsLoaded());
 
   CFWL_Edit* pWidget = cppgc::MakeGarbageCollected<CFWL_Edit>(
       GetFWLApp()->GetHeap()->GetAllocationHandle(), GetFWLApp(),
diff --git a/xfa/fxfa/cxfa_ffpageview.cpp b/xfa/fxfa/cxfa_ffpageview.cpp
index 960c1ab..5133871 100644
--- a/xfa/fxfa/cxfa_ffpageview.cpp
+++ b/xfa/fxfa/cxfa_ffpageview.cpp
@@ -12,6 +12,7 @@
 
 #include "fxjs/gc/container_trace.h"
 #include "fxjs/xfa/cjx_object.h"
+#include "third_party/base/check.h"
 #include "third_party/base/stl_util.h"
 #include "xfa/fxfa/cxfa_ffcheckbutton.h"
 #include "xfa/fxfa/cxfa_ffdoc.h"
@@ -30,8 +31,8 @@
 CFX_Matrix GetPageMatrix(const CFX_RectF& docPageRect,
                          const FX_RECT& devicePageRect,
                          int32_t iRotate) {
-  ASSERT(iRotate >= 0);
-  ASSERT(iRotate <= 3);
+  DCHECK(iRotate >= 0);
+  DCHECK(iRotate <= 3);
 
   CFX_Matrix m;
   if (iRotate == 0 || iRotate == 2) {
diff --git a/xfa/fxfa/cxfa_ffpasswordedit.cpp b/xfa/fxfa/cxfa_ffpasswordedit.cpp
index 5d68da1..1bf03a0 100644
--- a/xfa/fxfa/cxfa_ffpasswordedit.cpp
+++ b/xfa/fxfa/cxfa_ffpasswordedit.cpp
@@ -6,6 +6,7 @@
 
 #include "xfa/fxfa/cxfa_ffpasswordedit.h"
 
+#include "third_party/base/check.h"
 #include "xfa/fwl/cfwl_edit.h"
 #include "xfa/fwl/cfwl_notedriver.h"
 #include "xfa/fxfa/cxfa_ffdoc.h"
@@ -24,7 +25,7 @@
 }
 
 bool CXFA_FFPasswordEdit::LoadWidget() {
-  ASSERT(!IsLoaded());
+  DCHECK(!IsLoaded());
 
   CFWL_Edit* pWidget = cppgc::MakeGarbageCollected<CFWL_Edit>(
       GetFWLApp()->GetHeap()->GetAllocationHandle(), GetFWLApp(),
diff --git a/xfa/fxfa/cxfa_ffpushbutton.cpp b/xfa/fxfa/cxfa_ffpushbutton.cpp
index c35360c..0078ff9 100644
--- a/xfa/fxfa/cxfa_ffpushbutton.cpp
+++ b/xfa/fxfa/cxfa_ffpushbutton.cpp
@@ -6,6 +6,7 @@
 
 #include "xfa/fxfa/cxfa_ffpushbutton.h"
 
+#include "third_party/base/check.h"
 #include "v8/include/cppgc/visitor.h"
 #include "xfa/fwl/cfwl_notedriver.h"
 #include "xfa/fwl/cfwl_pushbutton.h"
@@ -58,7 +59,7 @@
 }
 
 bool CXFA_FFPushButton::LoadWidget() {
-  ASSERT(!IsLoaded());
+  DCHECK(!IsLoaded());
 
   CFWL_PushButton* pPushButton = cppgc::MakeGarbageCollected<CFWL_PushButton>(
       GetFWLApp()->GetHeap()->GetAllocationHandle(), GetFWLApp());
diff --git a/xfa/fxfa/cxfa_ffsignature.cpp b/xfa/fxfa/cxfa_ffsignature.cpp
index 7360375..9487a7c 100644
--- a/xfa/fxfa/cxfa_ffsignature.cpp
+++ b/xfa/fxfa/cxfa_ffsignature.cpp
@@ -6,6 +6,7 @@
 
 #include "xfa/fxfa/cxfa_ffsignature.h"
 
+#include "third_party/base/check.h"
 #include "xfa/fxfa/cxfa_ffdoc.h"
 #include "xfa/fxfa/cxfa_fffield.h"
 #include "xfa/fxfa/cxfa_ffpageview.h"
@@ -17,7 +18,7 @@
 CXFA_FFSignature::~CXFA_FFSignature() = default;
 
 bool CXFA_FFSignature::LoadWidget() {
-  ASSERT(!IsLoaded());
+  DCHECK(!IsLoaded());
   return CXFA_FFField::LoadWidget();
 }
 
diff --git a/xfa/fxfa/cxfa_fftextedit.cpp b/xfa/fxfa/cxfa_fftextedit.cpp
index c0c51b8..58b7f76 100644
--- a/xfa/fxfa/cxfa_fftextedit.cpp
+++ b/xfa/fxfa/cxfa_fftextedit.cpp
@@ -9,6 +9,7 @@
 #include <memory>
 #include <utility>
 
+#include "third_party/base/check.h"
 #include "xfa/fwl/cfwl_datetimepicker.h"
 #include "xfa/fwl/cfwl_edit.h"
 #include "xfa/fwl/cfwl_eventtextwillchange.h"
@@ -50,7 +51,7 @@
 }
 
 bool CXFA_FFTextEdit::LoadWidget() {
-  ASSERT(!IsLoaded());
+  DCHECK(!IsLoaded());
 
   CFWL_Edit* pFWLEdit = cppgc::MakeGarbageCollected<CFWL_Edit>(
       GetFWLApp()->GetHeap()->GetAllocationHandle(), GetFWLApp(),
diff --git a/xfa/fxfa/cxfa_ffwidget.cpp b/xfa/fxfa/cxfa_ffwidget.cpp
index 43cec04..84e7e62 100644
--- a/xfa/fxfa/cxfa_ffwidget.cpp
+++ b/xfa/fxfa/cxfa_ffwidget.cpp
@@ -18,6 +18,7 @@
 #include "core/fxge/cfx_pathdata.h"
 #include "core/fxge/cfx_renderdevice.h"
 #include "core/fxge/dib/cfx_dibitmap.h"
+#include "third_party/base/check.h"
 #include "xfa/fwl/fwl_widgethit.h"
 #include "xfa/fxfa/cxfa_eventparam.h"
 #include "xfa/fxfa/cxfa_ffapp.h"
@@ -581,7 +582,7 @@
 }
 
 void CXFA_FFWidget::GetBorderColorAndThickness(FX_ARGB* cr, float* fWidth) {
-  ASSERT(GetNode()->IsWidgetReady());
+  DCHECK(GetNode()->IsWidgetReady());
   CXFA_Border* borderUI = GetNode()->GetUIBorder();
   if (!borderUI)
     return;
diff --git a/xfa/fxfa/cxfa_textlayout.cpp b/xfa/fxfa/cxfa_textlayout.cpp
index a13b8eb..e6a1135 100644
--- a/xfa/fxfa/cxfa_textlayout.cpp
+++ b/xfa/fxfa/cxfa_textlayout.cpp
@@ -20,6 +20,7 @@
 #include "core/fxge/cfx_renderdevice.h"
 #include "core/fxge/text_char_pos.h"
 #include "fxjs/xfa/cjx_object.h"
+#include "third_party/base/check.h"
 #include "third_party/base/notreached.h"
 #include "third_party/base/stl_util.h"
 #include "xfa/fde/cfde_textout.h"
@@ -87,7 +88,7 @@
       m_pTextProvider(pTextProvider),
       m_pTextParser(cppgc::MakeGarbageCollected<CXFA_TextParser>(
           doc->GetHeap()->GetAllocationHandle())) {
-  ASSERT(m_pTextProvider);
+  DCHECK(m_pTextProvider);
 }
 
 CXFA_TextLayout::~CXFA_TextLayout() = default;
@@ -484,7 +485,7 @@
 }
 
 bool CXFA_TextLayout::LayoutInternal(size_t szBlockIndex) {
-  ASSERT(szBlockIndex < CountBlocks());
+  DCHECK(szBlockIndex < CountBlocks());
 
   if (!m_pLoader || m_pLoader->fWidth < 1)
     return false;
diff --git a/xfa/fxfa/cxfa_textparser.cpp b/xfa/fxfa/cxfa_textparser.cpp
index aae5179..3ac9e3e 100644
--- a/xfa/fxfa/cxfa_textparser.cpp
+++ b/xfa/fxfa/cxfa_textparser.cpp
@@ -18,6 +18,7 @@
 #include "core/fxcrt/xml/cfx_xmlelement.h"
 #include "core/fxcrt/xml/cfx_xmlnode.h"
 #include "core/fxge/fx_font.h"
+#include "third_party/base/check.h"
 #include "third_party/base/notreached.h"
 #include "xfa/fgas/font/cfgas_fontmgr.h"
 #include "xfa/fgas/font/cfgas_gefont.h"
@@ -175,7 +176,7 @@
 RetainPtr<CFX_CSSComputedStyle> CXFA_TextParser::CreateStyle(
     const CFX_CSSComputedStyle* pParentStyle) {
   auto pNewStyle = m_pSelector->CreateComputedStyle(pParentStyle);
-  ASSERT(pNewStyle);
+  DCHECK(pNewStyle);
   if (!pParentStyle)
     return pNewStyle;
 
diff --git a/xfa/fxfa/cxfa_textprovider.cpp b/xfa/fxfa/cxfa_textprovider.cpp
index 66f9e6c..c08452d 100644
--- a/xfa/fxfa/cxfa_textprovider.cpp
+++ b/xfa/fxfa/cxfa_textprovider.cpp
@@ -11,6 +11,7 @@
 #include "fxjs/xfa/cfxjse_engine.h"
 #include "fxjs/xfa/cfxjse_value.h"
 #include "fxjs/xfa/cjx_object.h"
+#include "third_party/base/check.h"
 #include "xfa/fde/cfde_textout.h"
 #include "xfa/fxfa/cxfa_eventparam.h"
 #include "xfa/fxfa/cxfa_ffapp.h"
@@ -35,7 +36,7 @@
 CXFA_TextProvider::CXFA_TextProvider(CXFA_Node* pNode,
                                      XFA_TEXTPROVIDERTYPE eType)
     : m_pNode(pNode), m_eType(eType) {
-  ASSERT(m_pNode);
+  DCHECK(m_pNode);
 }
 
 CXFA_TextProvider::~CXFA_TextProvider() = default;
diff --git a/xfa/fxfa/fm2js/cxfa_fmexpression.cpp b/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
index 38e58e9..b4af8c9 100644
--- a/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
+++ b/xfa/fxfa/fm2js/cxfa_fmexpression.cpp
@@ -13,6 +13,7 @@
 #include "core/fxcrt/cfx_widetextbuf.h"
 #include "core/fxcrt/fx_extension.h"
 #include "fxjs/gc/container_trace.h"
+#include "third_party/base/check.h"
 #include "v8/include/cppgc/visitor.h"
 #include "xfa/fxfa/fm2js/cxfa_fmtojavascriptdepth.h"
 
@@ -720,7 +721,7 @@
     : m_wsName(std::move(wsName)),
       m_pArguments(std::move(arguments)),
       m_pExpressions(std::move(expressions)) {
-  ASSERT(!m_wsName.IsEmpty());
+  DCHECK(!m_wsName.IsEmpty());
 }
 
 CXFA_FMFunctionDefinition::~CXFA_FMFunctionDefinition() = default;
@@ -952,7 +953,7 @@
       m_pIfExpression(pIfExpression),
       m_pElseIfExpressions(std::move(pElseIfExpressions)),
       m_pElseExpression(pElseExpression) {
-  ASSERT(m_pExpression);
+  DCHECK(m_pExpression);
 }
 
 CXFA_FMIfExpression::~CXFA_FMIfExpression() = default;
diff --git a/xfa/fxfa/layout/cxfa_contentlayoutprocessor.cpp b/xfa/fxfa/layout/cxfa_contentlayoutprocessor.cpp
index 93f9084..9c48284 100644
--- a/xfa/fxfa/layout/cxfa_contentlayoutprocessor.cpp
+++ b/xfa/fxfa/layout/cxfa_contentlayoutprocessor.cpp
@@ -12,6 +12,7 @@
 
 #include "fxjs/gc/container_trace.h"
 #include "fxjs/xfa/cjx_object.h"
+#include "third_party/base/check.h"
 #include "third_party/base/compiler_specific.h"
 #include "third_party/base/containers/adapters.h"
 #include "third_party/base/notreached.h"
@@ -622,8 +623,8 @@
     : m_pHeap(pHeap),
       m_pFormNode(pNode),
       m_pViewLayoutProcessor(pViewLayoutProcessor) {
-  ASSERT(GetFormNode());
-  ASSERT(GetFormNode()->IsContainerNode() ||
+  DCHECK(GetFormNode());
+  DCHECK(GetFormNode()->IsContainerNode() ||
          GetFormNode()->GetElementType() == XFA_Element::Form);
   m_pOldLayoutItem =
       ToContentLayoutItem(GetFormNode()->JSObject()->GetLayoutItem());
@@ -670,7 +671,7 @@
 }
 
 float CXFA_ContentLayoutProcessor::FindSplitPos(float fProposedSplitPos) {
-  ASSERT(m_pLayoutItem);
+  DCHECK(m_pLayoutItem);
   auto value = GetFormNode()->JSObject()->TryEnum(XFA_Attribute::Layout, true);
   XFA_AttributeValue eLayout = value.value_or(XFA_AttributeValue::Position);
   bool bCalculateMargin = eLayout != XFA_AttributeValue::Position;
@@ -811,7 +812,7 @@
 }
 
 void CXFA_ContentLayoutProcessor::SplitLayoutItem(float fSplitPos) {
-  ASSERT(m_pLayoutItem);
+  DCHECK(m_pLayoutItem);
   SplitLayoutItem(m_pLayoutItem.Get(), nullptr, fSplitPos);
 }
 
@@ -1153,7 +1154,7 @@
   if (!pLayoutNode)
     pLayoutNode = GetFormNode();
 
-  ASSERT(!m_pCurChildNode);
+  DCHECK(!m_pCurChildNode);
 
   m_pLayoutItem = CreateContentLayoutItem(GetFormNode());
   bool bContainerWidthAutoSize = true;
@@ -1800,7 +1801,7 @@
           break;
         }
         case Stage::kContainer: {
-          ASSERT(m_pCurChildNode->IsContainerNode());
+          DCHECK(m_pCurChildNode->IsContainerNode());
           if (m_pCurChildNode->GetElementType() == XFA_Element::Variables)
             break;
           if (fContentCurRowY >= fHeightLimit + kXFALayoutPrecision &&
@@ -2055,7 +2056,7 @@
   if (m_pLayoutItem)
     return;
 
-  ASSERT(!m_pCurChildNode);
+  DCHECK(!m_pCurChildNode);
   m_pLayoutItem = CreateContentLayoutItem(GetFormNode());
   if (!m_pLayoutItem)
     return;
diff --git a/xfa/fxfa/layout/cxfa_viewlayoutprocessor.cpp b/xfa/fxfa/layout/cxfa_viewlayoutprocessor.cpp
index caba9df..b679423 100644
--- a/xfa/fxfa/layout/cxfa_viewlayoutprocessor.cpp
+++ b/xfa/fxfa/layout/cxfa_viewlayoutprocessor.cpp
@@ -11,6 +11,7 @@
 #include "fxjs/gc/container_trace.h"
 #include "fxjs/xfa/cfxjse_engine.h"
 #include "fxjs/xfa/cjx_object.h"
+#include "third_party/base/check.h"
 #include "third_party/base/stl_util.h"
 #include "xfa/fxfa/cxfa_ffnotify.h"
 #include "xfa/fxfa/cxfa_ffpageview.h"
@@ -381,7 +382,7 @@
 
   m_pPageSetNode = pTemplateNode->JSObject()->GetOrCreateProperty<CXFA_PageSet>(
       0, XFA_Element::PageSet);
-  ASSERT(m_pPageSetNode);
+  DCHECK(m_pPageSetNode);
 
   if (m_pPageSetRootLayoutItem) {
     m_pPageSetRootLayoutItem->RemoveSelfIfParented();
@@ -597,7 +598,7 @@
 CXFA_ViewLayoutProcessor::CXFA_ViewRecord*
 CXFA_ViewLayoutProcessor::CreateViewRecord(CXFA_Node* pPageNode,
                                            bool bCreateNew) {
-  ASSERT(pPageNode);
+  DCHECK(pPageNode);
   auto* pNewRecord = cppgc::MakeGarbageCollected<CXFA_ViewRecord>(
       GetHeap()->GetAllocationHandle());
   if (!HasCurrentViewRecord()) {
@@ -1679,7 +1680,7 @@
     CXFA_Node* pPendingPageSet = nullptr;
     ViewLayoutItemIterator iterator(pRootLayout);
     CXFA_ViewLayoutItem* pRootPageSetViewItem = iterator.GetCurrent();
-    ASSERT(pRootPageSetViewItem->GetFormNode()->GetElementType() ==
+    DCHECK(pRootPageSetViewItem->GetFormNode()->GetElementType() ==
            XFA_Element::PageSet);
     if (pending_index < pDocument->GetPendingNodesCount()) {
       pPendingPageSet = pDocument->GetPendingNodeAtIndex(pending_index);
diff --git a/xfa/fxfa/parser/cxfa_dataexporter.cpp b/xfa/fxfa/parser/cxfa_dataexporter.cpp
index 50106ab..6861a2b 100644
--- a/xfa/fxfa/parser/cxfa_dataexporter.cpp
+++ b/xfa/fxfa/parser/cxfa_dataexporter.cpp
@@ -9,6 +9,7 @@
 #include "core/fxcrt/fx_codepage.h"
 #include "core/fxcrt/xml/cfx_xmlelement.h"
 #include "core/fxcrt/xml/cfx_xmlnode.h"
+#include "third_party/base/check.h"
 #include "xfa/fxfa/parser/cxfa_document.h"
 #include "xfa/fxfa/parser/cxfa_node.h"
 #include "xfa/fxfa/parser/xfa_utils.h"
@@ -19,10 +20,7 @@
 
 bool CXFA_DataExporter::Export(const RetainPtr<IFX_SeekableStream>& pStream,
                                CXFA_Node* pNode) {
-  ASSERT(pStream);
-
-  if (!pStream)
-    return false;
+  DCHECK(pStream);
 
   if (pNode->IsModelNode()) {
     switch (pNode->GetPacketType()) {
@@ -42,7 +40,7 @@
           return false;
 
         CXFA_Node* pDataNode = pNode->GetFirstChild();
-        ASSERT(pDataNode);
+        DCHECK(pDataNode);
         XFA_DataExporter_DealWithDataGroupNode(pDataNode);
         pElement->Save(pStream);
         break;
diff --git a/xfa/fxfa/parser/cxfa_document.cpp b/xfa/fxfa/parser/cxfa_document.cpp
index 295c6e8..1e74a81 100644
--- a/xfa/fxfa/parser/cxfa_document.cpp
+++ b/xfa/fxfa/parser/cxfa_document.cpp
@@ -15,6 +15,7 @@
 #include "fxjs/gc/container_trace.h"
 #include "fxjs/xfa/cfxjse_engine.h"
 #include "fxjs/xfa/cjx_object.h"
+#include "third_party/base/check.h"
 #include "third_party/base/compiler_specific.h"
 #include "third_party/base/notreached.h"
 #include "third_party/base/stl_util.h"
@@ -71,7 +72,7 @@
 };
 
 void FormValueNode_MatchNoneCreateChild(CXFA_Node* pFormNode) {
-  ASSERT(pFormNode->IsWidgetReady());
+  DCHECK(pFormNode->IsWidgetReady());
   // GetUIChildNode has the side effect of creating the UI child.
   pFormNode->GetUIChildNode();
 }
@@ -94,7 +95,7 @@
   if (!pValueNode)
     return;
 
-  ASSERT(pValueNode->GetPacketType() == XFA_PacketType::Form);
+  DCHECK(pValueNode->GetPacketType() == XFA_PacketType::Form);
   CXFA_Node* pChildNode = FormValueNode_CreateChild(pValueNode, iType);
   if (!pChildNode)
     return;
@@ -493,7 +494,7 @@
   if (eType != XFA_Element::Field && eType != XFA_Element::ExclGroup)
     return;
 
-  ASSERT(pFormNode->IsWidgetReady());
+  DCHECK(pFormNode->IsWidgetReady());
   auto* defValue = pFormNode->JSObject()->GetOrCreateProperty<CXFA_Value>(
       0, XFA_Element::Value);
   if (!bDataToForm) {
@@ -510,7 +511,7 @@
         }
         CFX_XMLElement* pXMLDataElement =
             ToXMLElement(pDataNode->GetXMLMappingNode());
-        ASSERT(pXMLDataElement);
+        DCHECK(pXMLDataElement);
         pDataNode->JSObject()->SetAttributeValue(
             wsValue, pFormNode->GetFormatDataValue(wsValue));
         pDataNode->JSObject()->SetCData(XFA_Attribute::ContentType,
@@ -783,7 +784,7 @@
                                bool bUpLevel) {
   CXFA_Node* pFieldNode = XFA_NodeMerge_CloneOrMergeContainer(
       pDocument, pFormNode, pTemplateNode, false, nullptr);
-  ASSERT(pFieldNode);
+  DCHECK(pFieldNode);
   for (CXFA_Node* pTemplateChildNode = pTemplateNode->GetFirstChild();
        pTemplateChildNode;
        pTemplateChildNode = pTemplateChildNode->GetNextSibling()) {
@@ -900,7 +901,7 @@
           pFirstInstance = pSubformNode;
 
         CreateDataBinding(pSubformNode, pDataNode, true);
-        ASSERT(pSubformNode);
+        DCHECK(pSubformNode);
         subformMapArray[pSubformNode] = pDataNode;
         nodeArray.push_back(pSubformNode);
       }
@@ -943,7 +944,7 @@
           eRelation == XFA_AttributeValue::Unordered) {
         CXFA_Node* pSubformSetNode = XFA_NodeMerge_CloneOrMergeContainer(
             pDocument, pFormParentNode, pTemplateNode, false, pSearchArray);
-        ASSERT(pSubformSetNode);
+        DCHECK(pSubformSetNode);
         if (!pFirstInstance)
           pFirstInstance = pSubformSetNode;
 
@@ -983,7 +984,7 @@
 
         switch (eRelation) {
           case XFA_AttributeValue::Choice: {
-            ASSERT(!rgItemMatchList.empty());
+            DCHECK(!rgItemMatchList.empty());
             SortRecurseRecord(&rgItemMatchList, pDataScope, true);
             pDocument->DataMerge_CopyContainer(
                 rgItemMatchList.front().pTemplateChild, pSubformSetNode,
@@ -1011,7 +1012,7 @@
       } else {
         CXFA_Node* pSubformSetNode = XFA_NodeMerge_CloneOrMergeContainer(
             pDocument, pFormParentNode, pTemplateNode, false, pSearchArray);
-        ASSERT(pSubformSetNode);
+        DCHECK(pSubformSetNode);
         if (!pFirstInstance)
           pFirstInstance = pSubformSetNode;
 
@@ -1052,7 +1053,7 @@
         }
         CXFA_Node* pSubformNode = XFA_NodeMerge_CloneOrMergeContainer(
             pDocument, pFormParentNode, pTemplateNode, false, pSearchArray);
-        ASSERT(pSubformNode);
+        DCHECK(pSubformNode);
         if (!pFirstInstance)
           pFirstInstance = pSubformNode;
 
@@ -1076,7 +1077,7 @@
   for (; iCurRepeatIndex < iMinimalLimit; iCurRepeatIndex++) {
     CXFA_Node* pSubformSetNode = XFA_NodeMerge_CloneOrMergeContainer(
         pDocument, pFormParentNode, pTemplateNode, false, pSearchArray);
-    ASSERT(pSubformSetNode);
+    DCHECK(pSubformSetNode);
     if (!pFirstInstance)
       pFirstInstance = pSubformSetNode;
 
@@ -1146,7 +1147,7 @@
           } else {
             CXFA_Node* pDataParent = pDataNode->GetParent();
             if (pDataParent != pDataScope) {
-              ASSERT(pDataParent);
+              DCHECK(pDataParent);
               pDataParent->RemoveChildAndNotify(pDataNode, true);
               pDataScope->InsertChildAndNotify(pDataNode, nullptr);
             }
@@ -1232,7 +1233,7 @@
 }
 
 void UpdateDataRelation(CXFA_Node* pDataNode, CXFA_Node* pDataDescriptionNode) {
-  ASSERT(pDataDescriptionNode);
+  DCHECK(pDataDescriptionNode);
   for (CXFA_Node* pDataChild = pDataNode->GetFirstChild(); pDataChild;
        pDataChild = pDataChild->GetNextSibling()) {
     uint32_t dwNameHash = pDataChild->GetNameHash();
@@ -1442,13 +1443,13 @@
 }
 
 CFXJSE_Engine* CXFA_Document::InitScriptContext(CJS_Runtime* fxjs_runtime) {
-  ASSERT(!m_pScriptContext);
+  DCHECK(!m_pScriptContext);
   m_pScriptContext = std::make_unique<CFXJSE_Engine>(this, fxjs_runtime);
   return m_pScriptContext.get();
 }
 
 CFXJSE_Engine* CXFA_Document::GetScriptContext() const {
-  ASSERT(m_pScriptContext);
+  DCHECK(m_pScriptContext);
   return m_pScriptContext.get();
 }
 
@@ -1594,7 +1595,7 @@
                                                   bool bOneInstance,
                                                   bool bDataMerge,
                                                   bool bUpLevel) {
-  ASSERT(pTemplateNode->IsContainerNode());
+  DCHECK(pTemplateNode->IsContainerNode());
   switch (pTemplateNode->GetElementType()) {
     case XFA_Element::Area:
     case XFA_Element::PageArea:
@@ -1723,7 +1724,7 @@
     bEmptyForm = true;
     pFormRoot = static_cast<CXFA_Form*>(
         CreateNode(XFA_PacketType::Form, XFA_Element::Form));
-    ASSERT(pFormRoot);
+    DCHECK(pFormRoot);
     pFormRoot->JSObject()->SetCData(XFA_Attribute::Name, L"form");
     m_pRootNode->InsertChildAndNotify(pFormRoot, nullptr);
   } else {
@@ -1737,7 +1738,7 @@
 
   CXFA_Node* pSubformSetNode = XFA_NodeMerge_CloneOrMergeContainer(
       this, pFormRoot, pTemplateChosen, false, nullptr);
-  ASSERT(pSubformSetNode);
+  DCHECK(pSubformSetNode);
   if (!pDataTopLevel) {
     WideString wsFormName =
         pSubformSetNode->JSObject()->GetCData(XFA_Attribute::Name);
@@ -1757,7 +1758,7 @@
     pDataRoot->InsertChildAndNotify(pDataTopLevel, pBeforeNode);
   }
 
-  ASSERT(pDataTopLevel);
+  DCHECK(pDataTopLevel);
   CreateDataBinding(pSubformSetNode, pDataTopLevel, true);
   for (CXFA_Node* pTemplateChild = pTemplateChosen->GetFirstChild();
        pTemplateChild; pTemplateChild = pTemplateChild->GetNextSibling()) {
diff --git a/xfa/fxfa/parser/cxfa_document_builder.cpp b/xfa/fxfa/parser/cxfa_document_builder.cpp
index 8a40cf0..6a74532 100644
--- a/xfa/fxfa/parser/cxfa_document_builder.cpp
+++ b/xfa/fxfa/parser/cxfa_document_builder.cpp
@@ -21,6 +21,7 @@
 #include "core/fxcrt/xml/cfx_xmlnode.h"
 #include "core/fxcrt/xml/cfx_xmltext.h"
 #include "fxjs/xfa/cjx_object.h"
+#include "third_party/base/check.h"
 #include "third_party/base/notreached.h"
 #include "third_party/base/optional.h"
 #include "xfa/fxfa/fxfa.h"
@@ -762,7 +763,7 @@
     if (pXFANode->IsContentNode()) {
       CXFA_Node* pContentRawDataNode =
           node_factory_->CreateNode(ePacketID, element);
-      ASSERT(pContentRawDataNode);
+      DCHECK(pContentRawDataNode);
       pContentRawDataNode->JSObject()->SetCData(XFA_Attribute::Value, wsValue);
       pXFANode->InsertChildAndNotify(pContentRawDataNode, nullptr);
     } else {
diff --git a/xfa/fxfa/parser/cxfa_localemgr.cpp b/xfa/fxfa/parser/cxfa_localemgr.cpp
index b5da74e..3caec11 100644
--- a/xfa/fxfa/parser/cxfa_localemgr.cpp
+++ b/xfa/fxfa/parser/cxfa_localemgr.cpp
@@ -15,6 +15,7 @@
 #include "core/fxcrt/fx_memory_wrappers.h"
 #include "fxjs/gc/container_trace.h"
 #include "fxjs/xfa/cjx_object.h"
+#include "third_party/base/check.h"
 #include "xfa/fxfa/parser/cxfa_acrobat.h"
 #include "xfa/fxfa/parser/cxfa_common.h"
 #include "xfa/fxfa/parser/cxfa_locale.h"
@@ -1236,7 +1237,7 @@
   if (m_bConfigLocaleCached)
     return m_wsConfigLocale;
 
-  ASSERT(!m_wsConfigLocale.has_value());
+  DCHECK(!m_wsConfigLocale.has_value());
   m_bConfigLocaleCached = true;
   if (!pConfig)
     return m_wsConfigLocale;
diff --git a/xfa/fxfa/parser/cxfa_localevalue.cpp b/xfa/fxfa/parser/cxfa_localevalue.cpp
index 15bbdbc..03cee6b 100644
--- a/xfa/fxfa/parser/cxfa_localevalue.cpp
+++ b/xfa/fxfa/parser/cxfa_localevalue.cpp
@@ -12,6 +12,7 @@
 #include <vector>
 
 #include "core/fxcrt/fx_extension.h"
+#include "third_party/base/check.h"
 #include "third_party/base/span.h"
 #include "third_party/base/stl_util.h"
 #include "xfa/fgas/crt/cfgas_stringformatter.h"
@@ -634,9 +635,9 @@
 void CXFA_LocaleValue::GetNumericFormat(WideString& wsFormat,
                                         int32_t nIntLen,
                                         int32_t nDecLen) {
-  ASSERT(wsFormat.IsEmpty());
-  ASSERT(nIntLen >= -1);
-  ASSERT(nDecLen >= -1);
+  DCHECK(wsFormat.IsEmpty());
+  DCHECK(nIntLen >= -1);
+  DCHECK(nDecLen >= -1);
 
   int32_t nTotalLen = (nIntLen >= 0 ? nIntLen : 2) + 1 +
                       (nDecLen >= 0 ? nDecLen : 2) + (nDecLen == 0 ? 0 : 1);
@@ -710,7 +711,7 @@
     return false;
 
   while (nf < nCountFmt && (cf = spFmt[nf]) != L'.') {
-    ASSERT(cf == L'z' || cf == L'*');
+    DCHECK(cf == L'z' || cf == L'*');
     ++nf;
   }
 
diff --git a/xfa/fxfa/parser/cxfa_node.cpp b/xfa/fxfa/parser/cxfa_node.cpp
index 9c5b127..d2d1e63 100644
--- a/xfa/fxfa/parser/cxfa_node.cpp
+++ b/xfa/fxfa/parser/cxfa_node.cpp
@@ -27,6 +27,7 @@
 #include "fxjs/xfa/cfxjse_engine.h"
 #include "fxjs/xfa/cfxjse_value.h"
 #include "fxjs/xfa/cjx_node.h"
+#include "third_party/base/check.h"
 #include "third_party/base/compiler_specific.h"
 #include "third_party/base/notreached.h"
 #include "third_party/base/span.h"
@@ -753,8 +754,8 @@
                       std::vector<CXFA_Node*>* pSiblings,
                       bool bIsClassName,
                       bool bIsFindProperty) {
-  ASSERT(parent);
-  ASSERT(pSiblings);
+  DCHECK(parent);
+  DCHECK(pSiblings);
 
   if (bIsFindProperty) {
     for (CXFA_Node* child :
@@ -982,7 +983,7 @@
       m_Attributes(attributes),
       m_ValidPackets(validPackets),
       m_ePacket(ePacket) {
-  ASSERT(m_pDocument);
+  DCHECK(m_pDocument);
 }
 
 CXFA_Node::~CXFA_Node() = default;
@@ -1075,7 +1076,7 @@
 
 const CXFA_Node::PropertyData* CXFA_Node::GetPropertyData(
     XFA_Element property) const {
-  ASSERT(property != XFA_Element::Unknown);
+  DCHECK(property != XFA_Element::Unknown);
   for (const auto& prop : m_Properties) {
     if (prop.property == property)
       return &prop;
@@ -1157,7 +1158,7 @@
 
 const CXFA_Node::AttributeData* CXFA_Node::GetAttributeData(
     XFA_Attribute attr) const {
-  ASSERT(attr != XFA_Attribute::Unknown);
+  DCHECK(attr != XFA_Attribute::Unknown);
   for (const auto& cur_attr : m_Attributes) {
     if (cur_attr.attribute == attr)
       return &cur_attr;
@@ -1252,7 +1253,7 @@
 }
 
 CXFA_Node* CXFA_Node::CloneTemplateToForm(bool bRecursive) {
-  ASSERT(m_ePacket == XFA_PacketType::Template);
+  DCHECK(m_ePacket == XFA_PacketType::Template);
   CXFA_Node* pClone =
       m_pDocument->CreateNode(XFA_PacketType::Form, m_elementType);
   if (!pClone)
@@ -1281,7 +1282,7 @@
 }
 
 CXFA_Node* CXFA_Node::GetBindData() {
-  ASSERT(GetPacketType() == XFA_PacketType::Form);
+  DCHECK(GetPacketType() == XFA_PacketType::Form);
   return GetBindingNode();
 }
 
@@ -1290,7 +1291,7 @@
 }
 
 void CXFA_Node::AddBindItem(CXFA_Node* pFormNode) {
-  ASSERT(pFormNode);
+  DCHECK(pFormNode);
 
   if (BindsFormItems()) {
     if (!pdfium::Contains(binding_nodes_, pFormNode))
@@ -1512,7 +1513,7 @@
 }
 
 void CXFA_Node::SetDataDescriptionNode(CXFA_Node* pDataDescriptionNode) {
-  ASSERT(m_ePacket == XFA_PacketType::Datasets);
+  DCHECK(m_ePacket == XFA_PacketType::Datasets);
   m_pAuxNode = pDataDescriptionNode;
 }
 
@@ -1589,7 +1590,7 @@
   if (!IsNeedSavingXMLNode() || !pNode->xml_node_)
     return;
 
-  ASSERT(!pNode->xml_node_->GetParent());
+  DCHECK(!pNode->xml_node_->GetParent());
   xml_node_->InsertBefore(pNode->xml_node_.Get(),
                           pBeforeNode ? pBeforeNode->xml_node_.Get() : nullptr);
 }
@@ -1611,7 +1612,7 @@
     return;
   }
 
-  ASSERT(pNode->xml_node_ == xml_node_);
+  DCHECK(pNode->xml_node_ == xml_node_);
   CFX_XMLElement* pXMLElement = ToXMLElement(pNode->xml_node_.Get());
   if (pXMLElement) {
     WideString wsAttributeName =
@@ -1777,7 +1778,7 @@
 }
 
 void CXFA_Node::SetFlagAndNotify(uint32_t dwFlag) {
-  ASSERT(dwFlag == XFA_NodeFlag_Initialized);
+  DCHECK(dwFlag == XFA_NodeFlag_Initialized);
 
   if (!IsInitialized()) {
     CXFA_FFNotify* pNotify = m_pDocument->GetNotify();
@@ -2001,7 +2002,7 @@
   }
   if (!pDataScope) {
     pDataScope = ToNode(pDocument->GetXFAObject(XFA_HASHCODE_Record));
-    ASSERT(pDataScope);
+    DCHECK(pDataScope);
   }
 
   CXFA_Node* pInstance = pDocument->DataMerge_CopyContainer(
@@ -2731,7 +2732,7 @@
   if (m_ExecuteRecursionDepth > kMaxExecuteRecursion)
     return {XFA_EventError::kSuccess, false};
 
-  ASSERT(pEventParam);
+  DCHECK(pEventParam);
   if (!script)
     return {XFA_EventError::kNotExist, false};
   if (script->GetRunAt() == XFA_AttributeValue::Server)
@@ -2805,12 +2806,12 @@
 std::pair<XFA_FFWidgetType, CXFA_Ui*>
 CXFA_Node::CreateChildUIAndValueNodesIfNeeded() {
   XFA_Element eType = GetElementType();
-  ASSERT(eType == XFA_Element::Field || eType == XFA_Element::Draw);
+  DCHECK(eType == XFA_Element::Field || eType == XFA_Element::Draw);
 
   // Both Field and Draw have a UI property. We should always be able to
   // retrieve or create the UI element. If we can't something is wrong.
   CXFA_Ui* pUI = JSObject()->GetOrCreateProperty<CXFA_Ui>(0, XFA_Element::Ui);
-  ASSERT(pUI);
+  DCHECK(pUI);
 
   CXFA_Node* pUIChild = nullptr;
   // Search through the children of the UI node to see if we have any of our
@@ -2831,7 +2832,7 @@
   // reason something has gone really wrong.
   CXFA_Value* value =
       JSObject()->GetOrCreateProperty<CXFA_Value>(0, XFA_Element::Value);
-  ASSERT(value);
+  DCHECK(value);
 
   // The Value nodes only have One-Of children. So, if we have a first child
   // that child must be the type we want to use.
@@ -2944,7 +2945,7 @@
 }
 
 CXFA_Node* CXFA_Node::GetUIChildNode() {
-  ASSERT(HasCreatedUIWidget());
+  DCHECK(HasCreatedUIWidget());
 
   if (ff_widget_type_ != XFA_FFWidgetType::kNone)
     return ui_ ? ui_->GetFirstChild() : nullptr;
diff --git a/xfa/fxfa/parser/cxfa_nodeowner.cpp b/xfa/fxfa/parser/cxfa_nodeowner.cpp
index 03fa9fe..44a58bc 100644
--- a/xfa/fxfa/parser/cxfa_nodeowner.cpp
+++ b/xfa/fxfa/parser/cxfa_nodeowner.cpp
@@ -7,6 +7,7 @@
 #include "xfa/fxfa/parser/cxfa_nodeowner.h"
 
 #include "fxjs/gc/container_trace.h"
+#include "third_party/base/check.h"
 #include "xfa/fxfa/parser/cxfa_list.h"
 #include "xfa/fxfa/parser/cxfa_node.h"
 
@@ -19,6 +20,6 @@
 }
 
 void CXFA_NodeOwner::PersistList(CXFA_List* list) {
-  ASSERT(list);
+  DCHECK(list);
   lists_.emplace_back(list);
 }
diff --git a/xfa/fxfa/parser/cxfa_rectangle.cpp b/xfa/fxfa/parser/cxfa_rectangle.cpp
index cd920df..e640bc3 100644
--- a/xfa/fxfa/parser/cxfa_rectangle.cpp
+++ b/xfa/fxfa/parser/cxfa_rectangle.cpp
@@ -10,6 +10,7 @@
 #include <utility>
 
 #include "fxjs/xfa/cjx_node.h"
+#include "third_party/base/check.h"
 #include "third_party/base/notreached.h"
 #include "xfa/fxfa/parser/cxfa_corner.h"
 #include "xfa/fxfa/parser/cxfa_document.h"
@@ -460,8 +461,8 @@
                              int32_t nIndex,
                              bool bStart,
                              bool bCorner) {
-  ASSERT(nIndex >= 0);
-  ASSERT(nIndex < 8);
+  DCHECK(nIndex >= 0);
+  DCHECK(nIndex < 8);
 
   int32_t n = (nIndex & 1) ? nIndex - 1 : nIndex;
   CXFA_Stroke* corner1 = strokes[n];
diff --git a/xfa/fxfa/parser/cxfa_xmllocale.cpp b/xfa/fxfa/parser/cxfa_xmllocale.cpp
index aaad186..b28c4ec 100644
--- a/xfa/fxfa/parser/cxfa_xmllocale.cpp
+++ b/xfa/fxfa/parser/cxfa_xmllocale.cpp
@@ -13,6 +13,7 @@
 #include "core/fxcrt/xml/cfx_xmldocument.h"
 #include "core/fxcrt/xml/cfx_xmlelement.h"
 #include "core/fxcrt/xml/cfx_xmlparser.h"
+#include "third_party/base/check.h"
 #include "xfa/fxfa/parser/cxfa_document.h"
 #include "xfa/fxfa/parser/cxfa_localemgr.h"
 #include "xfa/fxfa/parser/cxfa_nodelocale.h"
@@ -51,8 +52,8 @@
 CXFA_XMLLocale::CXFA_XMLLocale(std::unique_ptr<CFX_XMLDocument> doc,
                                CFX_XMLElement* locale)
     : xml_doc_(std::move(doc)), locale_(locale) {
-  ASSERT(xml_doc_);
-  ASSERT(locale_);
+  DCHECK(xml_doc_);
+  DCHECK(locale_);
 }
 
 CXFA_XMLLocale::~CXFA_XMLLocale() = default;
diff --git a/xfa/fxfa/parser/xfa_utils.cpp b/xfa/fxfa/parser/xfa_utils.cpp
index e9a01ba..098b662 100644
--- a/xfa/fxfa/parser/xfa_utils.cpp
+++ b/xfa/fxfa/parser/xfa_utils.cpp
@@ -18,6 +18,7 @@
 #include "core/fxcrt/xml/cfx_xmlnode.h"
 #include "core/fxcrt/xml/cfx_xmltext.h"
 #include "fxjs/xfa/cjx_object.h"
+#include "third_party/base/check.h"
 #include "third_party/base/stl_util.h"
 #include "xfa/fxfa/parser/cxfa_document.h"
 #include "xfa/fxfa/parser/cxfa_localemgr.h"
@@ -118,7 +119,7 @@
   if (!wsContent)
     return false;
 
-  ASSERT(pContentNode->IsContentNode());
+  DCHECK(pContentNode->IsContentNode());
   CXFA_Node* pParentNode = pContentNode->GetParent();
   if (!pParentNode || pParentNode->GetElementType() != XFA_Element::Value)
     return true;