Tsvb less update (elastic#65467)

Author: flash1293

docs/visualize/time-series-visual-builder.asciidoc

@@ -217,3 +217,17 @@ syntax uses the Handlebar.js processor which is an extended version of the Musta
 template language.
 
 image:images/tsvb-markdown-tab.png["Markdown Tab"]
+
+[float]
+[[tsvb-style-markdown]]
+==== Style Markdown text
+
+Style your Markdown visualization using http://lesscss.org/features/[less syntax].
+
+. Select *Markdown*.
+
+. Select *Panel options*.
+
+. Enter styling rules in *Custom CSS* section
++
+Less in TSVB does not support custom plugins or inline JavaScript.

package.json

@@ -190,7 +190,7 @@
     "leaflet-responsive-popup": "0.2.0",
     "leaflet-vega": "^0.8.6",
     "leaflet.heat": "0.2.0",
-    "less": "2.7.1",
+    "less": "npm:@elastic/less@2.7.3-kibana",
     "less-loader": "4.1.0",
     "lodash": "npm:@elastic/lodash@3.10.1-kibana4",
     "lru-cache": "4.1.1",

src/legacy/core_plugins/metrics/public/components/panel_config/markdown.js

@@ -64,7 +64,7 @@ class MarkdownPanelConfigUi extends Component {
     const lessSrc = `#markdown-${model.id} {
   ${value}
 }`;
-    lessC.render(lessSrc, { compress: true }, (e, output) => {
+    lessC.render(lessSrc, { compress: true, javascriptEnabled: false }, (e, output) => {
       const parts = { markdown_less: value };
       if (output) {
         parts.markdown_css = output.css;

yarn.lock

@@ -13727,17 +13727,18 @@ less-loader@4.1.0:
     loader-utils "^1.1.0"
     pify "^3.0.0"
 
-less@2.7.1:
-  version "2.7.1"
-  resolved "https://registry.yarnpkg.com/less/-/less-2.7.1.tgz#6cbfea22b3b830304e9a5fb371d54fa480c9d7cf"
-  integrity sha1-bL/qIrO4MDBOml+zcdVPpIDJ188=
+"less@npm:@elastic/less@2.7.3-kibana":
+  version "2.7.3-kibana"
+  resolved "https://registry.yarnpkg.com/@elastic/less/-/less-2.7.3-kibana.tgz#3de5e0b06bb095b1cc1149043d67f8dc36272d23"
+  integrity sha512-Okm31ZKE28/m3bH0h0mNpQH0zqVWNFqRKDlsBd1AYHGdM1yBq4mzeO6IRUykB81XDGlqL0m4ThSA7mc3hy+LVg==
   optionalDependencies:
     errno "^0.1.1"
     graceful-fs "^4.1.2"
     image-size "~0.5.0"
     mime "^1.2.11"
     mkdirp "^0.5.0"
     promise "^7.1.1"
+    request "2.81.0"
     source-map "^0.5.3"
 
 leven@^2.1.0: