Fix #895 (#896)

* Don't replace leading digit

* Install css.escape

* Escape leading digit of the anchor id

package.json

@@ -74,6 +74,7 @@
     "conventional-changelog-cli": "^2.0.25",
     "copy-dir": "^1.2.0",
     "cross-env": "^6.0.3",
+    "css.escape": "^1.5.1",
     "cssnano": "^4.1.10",
     "cypress": "^3.8.1",
     "cypress-image-snapshot": "^3.1.1",

src/core/event/scroll.js

@@ -1,6 +1,7 @@
 import { isMobile } from '../util/env'
 import * as dom from '../util/dom'
 import Tweezer from 'tweezer.js'
+import cssEscape from 'css.escape'
 
 const nav = {}
 let hoverOver = false
@@ -138,7 +139,7 @@ export function scrollIntoView(path, id) {
     return
   }
 
-  const section = dom.find('#' + id)
+  const section = dom.find('#' + cssEscape(id))
   section && scrollTo(section)
 
   const li = nav[getNavKey(path, id)]

src/core/render/slugify.js

@@ -19,7 +19,6 @@ export function slugify(str) {
     .replace(re, '')
     .replace(/\s/g, '-')
     .replace(/-+/g, '-')
-    .replace(/^(\d)/, '_$1')
   let count = cache[slug]
 
   count = hasOwn.call(cache, slug) ? count + 1 : 0