diff --git a/src/main.shy b/src/main.shy
index 77b6c8f5..ff890880 100644
--- a/src/main.shy
+++ b/src/main.shy
@@ -2,6 +2,12 @@ title "contexts"
 source recent.shy
 
 chapter "实践"
+chain `
+ice
+	mdb
+	web
+	aaa
+`
 label `
 code wiki chat team mall
 linux nginx docker redis mysql
diff --git a/src/template/web.wiki.chart/chart.html b/src/template/web.wiki.chart/chart.html
index 65f66f6d..8d09a0dd 100644
--- a/src/template/web.wiki.chart/chart.html
+++ b/src/template/web.wiki.chart/chart.html
@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" vertion="1.1" {{.OptionTemplate}} {{.OptionKV "height,width"}} text-anchor="middle" dominant-baseline="middle">
+<svg xmlns="http://www.w3.org/2000/svg" vertion="1.1" {{.OptionTemplate}} {{.OptionKV "height,width"}} text-anchor="middle">