Merge branch 'tz-critical-css-poc' into 'master'

Startup.CSS

See merge request gitlab-org/gitlab!38052

.scss-lint.yml

@@ -7,6 +7,7 @@ scss_files:
 
 exclude:
   - 'app/assets/stylesheets/pages/emojis.scss'
+  - 'app/assets/stylesheets/startup/startup-general.scss'
 
 linters:
   # Reports when you use improper spacing around ! (the "bang") in !default,

app/assets/stylesheets/application.scss

@@ -51,3 +51,9 @@
 @media print {
   @import 'print';
 }
+
+/* Rules for overriding cloaking in startup-general.scss */
+.container-limited,
+.modal-dialog {
+  display: block;
+}

app/assets/stylesheets/startup/startup-general.scss

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.sidebar-sub-level-items:not(.is-fly-out-only){display:block}.close-nav-button,.toggle-sidebar-button{width:219px;position:fixed;height:48px;bottom:0;padding:0 16px;background-color:#fafafa;border:0;border-top:1px solid #dbdbdb;color:#707070;display:flex;align-items:center}.close-nav-button svg,.toggle-sidebar-button svg{margin-right:8px}.close-nav-button .icon-chevron-double-lg-right,.toggle-sidebar-button .icon-chevron-double-lg-right{display:none}.collapse-text{white-space:nowrap;overflow:hidden}.fly-out-top-item>a{display:flex}.fly-out-top-item .fly-out-badge{margin-left:8px}.fly-out-top-item-name{flex:1}.close-nav-button{display:none}@media (max-width:767.98px){.close-nav-button{display:flex}.toggle-sidebar-button{display:none}}input::-moz-placeholder{color:#919191;opacity:1}input:-ms-input-placeholder,input::-ms-input-placeholder{color:#919191}svg.s12{width:12px;height:12px}svg.s16{width:16px;height:16px}svg.s18{width:18px;height:18px}.feature-highlight-popover-sub-content{padding:16px 12px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}.color-label{padding:0 .5rem;line-height:16px;border-radius:100px;color:#fff}.label-link{display:inline-flex;vertical-align:text-bottom}.milestones{padding:8px;margin-top:8px;border-radius:4px;background-color:#dbdbdb}.search{margin:0 8px}@media (min-width:1200px){.search form{width:320px}}.search .search-input{border:0;font-size:14px;padding:0 20px 0 0;margin-left:5px;line-height:25px;width:98%;color:#fff;background:0 0}.search .search-input-container{display:flex;position:relative}.search .search-input-wrap{width:100%}.search .search-input-wrap .clear-icon,.search .search-input-wrap .search-icon{position:absolute;right:5px;top:4px}.search .search-input-wrap .search-icon{-moz-user-select:none;user-select:none}.search .search-input-wrap .clear-icon{display:none}.search .search-input-wrap .dropdown{position:static}.search .search-input-wrap .dropdown-menu{left:-5px;max-height:400px;overflow:auto}@media (min-width:1200px){.search .search-input-wrap .dropdown-menu{width:320px}}.search .search-input-wrap .dropdown-content{max-height:382px}.search .identicon{flex-basis:16px;flex-shrink:0;margin-right:4px}.settings{border-top:1px solid #dbdbdb}.settings:first-of-type{margin-top:10px;border:0}.settings+div .settings:first-of-type{margin-top:0;border-top:1px solid #dbdbdb}.avatar,.avatar-container{float:left;margin-right:16px;border-radius:50%;border:1px solid #f5f5f5}.s16.avatar,.s16.avatar-container{width:16px;height:16px;margin-right:8px}.s18.avatar,.s18.avatar-container{width:18px;height:18px;margin-right:8px}.s40.avatar,.s40.avatar-container{width:40px;height:40px;margin-right:8px}.avatar{transition-property:none;width:40px;height:40px;padding:0;background:#fdfdfd;overflow:hidden;border-color:rgba(0,0,0,.1)}.avatar.center{font-size:14px;line-height:1.8em;text-align:center}.avatar.avatar-tile{border-radius:0;border:0}.identicon{text-align:center;vertical-align:top;color:#4f4f4f;background-color:#eee}.identicon.s16{font-size:10px;line-height:16px}.identicon.s40{font-size:16px;line-height:38px}.avatar-container{overflow:hidden;display:flex}.avatar-container a{width:100%;height:100%;display:flex;text-decoration:none}.avatar-container .avatar{border-radius:0;border:0;height:auto;width:100%;margin:0;align-self:center}.avatar-container.s40{min-width:40px;min-height:40px}.rect-avatar,.rect-avatar.s16,.rect-avatar.s18{border-radius:2px}.rect-avatar.s40{border-radius:4px}.tab-width-8{-moz-tab-size:8;tab-size:8}.gl-sr-only{border:0;clip:rect(0,0,0,0);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;white-space:nowrap;width:1px}.gl-ml-3{margin-left:.5rem}.container-limited,.modal-dialog{display:none}
\ No newline at end of file

app/helpers/application_helper.rb

@@ -231,6 +231,18 @@ module ApplicationHelper
     "#{request.path}?#{options.compact.to_param}"
   end
 
+  def use_startup_css?
+    params[:startup_css] == 'true' || cookies['startup_css'] == 'true'
+  end
+
+  def stylesheet_link_tag_defer(path)
+    if use_startup_css?
+      stylesheet_link_tag(path, media: "print", onload: "this.onload=null;this.media='all'")
+    else
+      stylesheet_link_tag(path, media: "all")
+    end
+  end
+
   def outdated_browser?
     browser.ie?
   end

app/views/layouts/_head.html.haml

@@ -49,14 +49,17 @@
 
   = favicon_link_tag favicon, id: 'favicon', data: { original_href: favicon }, type: 'image/png'
 
+  - if use_startup_css?
+    %style{ type: "text/css" }
+      = Rails.application.assets_manifest.find_sources('startup/startup-general.css').first.to_s.html_safe
   - if user_application_theme == 'gl-dark'
-    = stylesheet_link_tag "application_dark", media: "all"
+    = stylesheet_link_tag_defer "application_dark"
   - else
-    = stylesheet_link_tag "application", media: "all"
+    = stylesheet_link_tag_defer "application"
   = stylesheet_link_tag "disable_animations", media: "all" if Rails.env.test? || Gitlab.config.gitlab['disable_animations']
   = stylesheet_link_tag 'performance_bar' if performance_bar_enabled?
 
-  = stylesheet_link_tag "highlight/themes/#{user_color_scheme}", media: "all"
+  = stylesheet_link_tag_defer "highlight/themes/#{user_color_scheme}"
 
   = Gon::Base.render_data(nonce: content_security_policy_nonce)
 

config/application.rb

@@ -169,6 +169,8 @@ module Gitlab
 
     config.assets.precompile << "application_dark.css"
 
+    config.assets.precompile << "startup/*.css"
+
     config.assets.precompile << "print.css"
     config.assets.precompile << "mailer.css"
     config.assets.precompile << "mailer_client_specific.css"

package.json

@@ -26,7 +26,7 @@
     "prettier-staged-save": "node ./scripts/frontend/prettier.js save",
     "prettier-all": "node ./scripts/frontend/prettier.js check-all",
     "prettier-all-save": "node ./scripts/frontend/prettier.js save-all",
-    "stylelint": "yarn stylelint-file 'app/assets/stylesheets/**/*.*'  'ee/app/assets/stylesheets/**/*.*' '!**/vendors/**'",
+    "stylelint": "yarn stylelint-file 'app/assets/stylesheets/**/*.*'  'ee/app/assets/stylesheets/**/*.*' '!app/assets/stylesheets/startup/startup-general.scss' '!**/vendors/**'",
     "stylelint-file": "BROWSERSLIST_IGNORE_OLD_DATA=true node node_modules/stylelint/bin/stylelint.js",
     "stylelint-create-utility-map": "node scripts/frontend/stylelint/stylelint-utility-map.js",
     "test": "node scripts/frontend/test",