diff --git a/src/resources/hoedown.js b/src/resources/hoedown.js
index 8e324aed..42e4922d 100644
--- a/src/resources/hoedown.js
+++ b/src/resources/hoedown.js
@@ -14,7 +14,8 @@ marked.setOptions({
 });
 
 var updateHtml = function(html) {
-    asyncJobsCount = 0;
+    // There is at least one async job for MathJax.
+    asyncJobsCount = 1;
 
     contentDiv.innerHTML = html;
 
@@ -84,10 +85,10 @@ var updateHtml = function(html) {
             MathJax.Hub.Queue(["Typeset", MathJax.Hub, contentDiv, postProcessMathJax]);
         } catch (err) {
             content.setLog("err: " + err);
-            finishLogics();
+            finishOneAsyncJob();
         }
     } else {
-        finishLogics();
+        finishOneAsyncJob();
     }
 };
 
diff --git a/src/resources/markdown-it.js b/src/resources/markdown-it.js
index 889f3512..7082b8b6 100644
--- a/src/resources/markdown-it.js
+++ b/src/resources/markdown-it.js
@@ -126,7 +126,8 @@ var updateText = function(text) {
         text = "[TOC]\n\n" + text;
     }
 
-    asyncJobsCount = 0;
+    // There is at least one async job for MathJax.
+    asyncJobsCount = 1;
     metaDataText = null;
 
     var needToc = mdHasTocSection(text);
@@ -149,10 +150,10 @@ var updateText = function(text) {
             MathJax.Hub.Queue(["Typeset", MathJax.Hub, contentDiv, postProcessMathJax]);
         } catch (err) {
             content.setLog("err: " + err);
-            finishLogics();
+            finishOneAsyncJob();
         }
     } else {
-        finishLogics();
+        finishOneAsyncJob();
     }
 };
 
diff --git a/src/resources/markdown_template.js b/src/resources/markdown_template.js
index 5452f5e4..83942d69 100644
--- a/src/resources/markdown_template.js
+++ b/src/resources/markdown_template.js
@@ -1276,7 +1276,7 @@ var postProcessMathJax = function() {
         }
     }
 
-    finishLogics();
+    finishOneAsyncJob();
 };
 
 function getNodeText(el) {
diff --git a/src/resources/marked.js b/src/resources/marked.js
index ab4bdeb4..bc1ffbd2 100644
--- a/src/resources/marked.js
+++ b/src/resources/marked.js
@@ -50,7 +50,8 @@ var updateText = function(text) {
         text = "[TOC]\n\n" + text;
     }
 
-    asyncJobsCount = 0;
+    // There is at least one async job for MathJax.
+    asyncJobsCount = 1;
 
     var needToc = mdHasTocSection(text);
     var html = markdownToHtml(text, needToc);
@@ -71,10 +72,10 @@ var updateText = function(text) {
             MathJax.Hub.Queue(["Typeset", MathJax.Hub, contentDiv, postProcessMathJax]);
         } catch (err) {
             content.setLog("err: " + err);
-            finishLogics();
+            finishOneAsyncJob();
         }
     } else {
-        finishLogics();
+        finishOneAsyncJob();
     }
 };
 
diff --git a/src/resources/showdown.js b/src/resources/showdown.js
index ed1e85ed..74a957f0 100644
--- a/src/resources/showdown.js
+++ b/src/resources/showdown.js
@@ -89,7 +89,8 @@ var updateText = function(text) {
         text = "[TOC]\n\n" + text;
     }
 
-    asyncJobsCount = 0;
+    // There is at least one async job for MathJax.
+    asyncJobsCount = 1;
 
     var needToc = mdHasTocSection(text);
     var html = markdownToHtml(text, needToc);
@@ -116,10 +117,10 @@ var updateText = function(text) {
             MathJax.Hub.Queue(["Typeset", MathJax.Hub, contentDiv, postProcessMathJax]);
         } catch (err) {
             content.setLog("err: " + err);
-            finishLogics();
+            finishOneAsyncJob();
         }
     } else {
-        finishLogics();
+        finishOneAsyncJob();
     }
 };
 
diff --git a/src/utils/vutils.cpp b/src/utils/vutils.cpp
index 635b85a1..5e67631f 100644
--- a/src/utils/vutils.cpp
+++ b/src/utils/vutils.cpp
@@ -823,6 +823,10 @@ QString VUtils::generateExportHtmlTemplate(const QString &p_renderBg, bool p_inc
                              "SVG: {\n"
                                  "minScaleAdjust: 100,\n"
                                  "styles: {\n"
+/*
+FIXME: Using wkhtmltopdf, without 2em, the math formula will be very small. However,
+with 2em, if there are Chinese characters in it, the font will be a mess.
+*/
 #if defined(Q_OS_WIN)
                                    "\".MathJax_SVG\": {\n"
                                         "\"font-size\": \"2em !important\"\n"
diff --git a/src/vdocument.cpp b/src/vdocument.cpp
index 3aa5f5db..99fe8611 100644
--- a/src/vdocument.cpp
+++ b/src/vdocument.cpp
@@ -121,7 +121,7 @@ void VDocument::setFile(const VFile *p_file)
 
 void VDocument::finishLogics()
 {
-    qDebug() << "Web side finished logics";
+    qDebug() << "Web side finished logics" << this;
     emit logicsFinished();
 }