@@ -28,6 +28,30 @@ const _CURRENT_PREFIX = (() => {
2828const _ALL_VERSIONS = new Map ( $VERSIONS ) ;
2929const _ALL_LANGUAGES = new Map ( $LANGUAGES ) ;
3030
31+ /**
32+ * Required for Python 3.7 and earlier.
33+ *@returns {void }
34+ *@private
35+ */
36+ const _create_placeholders_if_missing = ( ) => {
37+ if ( document . querySelectorAll ( ".version_switcher_placeholder" ) . length ) return ;
38+
39+ const items = document . querySelectorAll ( "body>div.related>ul>li:not(.right)" ) ;
40+ for ( const item of items ) {
41+ if ( item . innerText . toLowerCase ( ) . includes ( "documentation" ) ) {
42+ const container = document . createElement ( "li" ) ;
43+ container . className = "switchers" ;
44+ for ( const placeholder_name of [ "language" , "version" ] ) {
45+ const placeholder = document . createElement ( "div" ) ;
46+ placeholder . className = `${ placeholder_name } ;
47+ container . appendChild ( placeholder ) ;
48+ }
49+ item . parentElement . insertBefore ( container , item ) ;
50+ return ;
51+ }
52+ }
53+ } ;
54+
3155/**
3256 *@param {Map<string, string> } versions
3357 *@returns {HTMLSelectElement }
@@ -175,6 +199,8 @@ const _initialise_switchers = () => {
175199const versions = _ALL_VERSIONS ;
176200const languages = _ALL_LANGUAGES ;
177201
202+ _create_placeholders_if_missing ( ) ;
203+
178204document
179205. querySelectorAll ( ".version_switcher_placeholder" )
180206. forEach ( ( placeholder ) => {