Starting from Atom v1.13.0, the contents of atom-text-editor elements are no longer encapsulated within a shadow DOM boundary. This means you should stop using :host and ::shadow pseudo-selectors, and prepend all your syntax selectors with syntax--. To prevent breakage with existing style sheets, Atom will automatically upgrade the following selectors:
atom-text-editor, :host => atom-text-editor,atom-text-editor
atom-text-editor .wrap-guide, :host .wrap-guide => atom-text-editor .wrap-guide,atom-text-editor .wrap-guide
atom-text-editor .indent-guide, :host .indent-guide => atom-text-editor .indent-guide,atom-text-editor .indent-guide
atom-text-editor .invisible-character, :host .invisible-character => atom-text-editor .invisible-character,atom-text-editor .invisible-character
atom-text-editor .gutter, :host .gutter => atom-text-editor .gutter,atom-text-editor .gutter
atom-text-editor .gutter .line-number.cursor-line, :host .gutter .line-number.cursor-line => atom-text-editor .gutter .line-number.cursor-line,atom-text-editor .gutter .line-number.cursor-line
atom-text-editor .gutter .line-number.cursor-line-no-selection, :host .gutter .line-number.cursor-line-no-selection => atom-text-editor .gutter .line-number.cursor-line-no-selection,atom-text-editor .gutter .line-number.cursor-line-no-selection
atom-text-editor .gutter .line-number.folded, :host .gutter .line-number.folded, atom-text-editor .gutter .line-number:after, :host .gutter .line-number:after, atom-text-editor .fold-marker:after, :host .fold-marker:after => atom-text-editor .gutter .line-number.folded,atom-text-editor .gutter .line-number.folded, atom-text-editor .gutter .line-number:after,atom-text-editor .gutter .line-number:after, atom-text-editor .fold-marker:after,atom-text-editor .fold-marker:after
atom-text-editor .invisible, :host .invisible => atom-text-editor .invisible,atom-text-editor .invisible
atom-text-editor .cursor, :host .cursor => atom-text-editor .cursor,atom-text-editor .cursor
atom-text-editor .selection .region, :host .selection .region => atom-text-editor .selection .region,atom-text-editor .selection .region
atom-text-editor .search-results .marker .region, :host .search-results .marker .region => atom-text-editor .search-results .syntax--marker .region,atom-text-editor .search-results .syntax--marker .region
atom-text-editor .search-results .marker.current-result .region, :host .search-results .marker.current-result .region => atom-text-editor .search-results .syntax--marker.current-result .region,atom-text-editor .search-results .syntax--marker.current-result .region
.comment => .syntax--comment
.entity.name.type => .syntax--entity.syntax--name.syntax--type
.entity.other.inherited-class => .syntax--entity.syntax--other.syntax--inherited-class
.keyword => .syntax--keyword
.keyword.control => .syntax--keyword.syntax--control
.keyword.operator => .syntax--keyword.syntax--operator
.keyword.other.special-method => .syntax--keyword.syntax--other.syntax--special-method
.keyword.other.unit => .syntax--keyword.syntax--other.syntax--unit
.storage => .syntax--storage
.constant => .syntax--constant
.constant.character.escape => .syntax--constant.syntax--character.syntax--escape
.constant.numeric => .syntax--constant.syntax--numeric
.constant.other.color => .syntax--constant.syntax--other.syntax--color
.constant.other.symbol => .syntax--constant.syntax--other.syntax--symbol
.variable => .syntax--variable
.variable.interpolation => .syntax--variable.syntax--interpolation
.variable.parameter.function => .syntax--variable.syntax--parameter.syntax--function
.invalid.illegal => .syntax--invalid.syntax--illegal
.string => .syntax--string
.string.regexp => .syntax--string.syntax--regexp
.string.regexp .source.ruby.embedded => .syntax--string.syntax--regexp .syntax--source.syntax--ruby.syntax--embedded
.string.other.link => .syntax--string.syntax--other.syntax--link
.punctuation.definition.comment => .syntax--punctuation.syntax--definition.syntax--comment
.punctuation.definition.string, .punctuation.definition.variable, .punctuation.definition.parameters, .punctuation.definition.array => .syntax--punctuation.syntax--definition.syntax--string, .syntax--punctuation.syntax--definition.syntax--variable, .syntax--punctuation.syntax--definition.syntax--parameters, .syntax--punctuation.syntax--definition.syntax--array
.punctuation.definition.heading, .punctuation.definition.identity => .syntax--punctuation.syntax--definition.syntax--heading, .syntax--punctuation.syntax--definition.syntax--identity
.punctuation.definition.bold => .syntax--punctuation.syntax--definition.syntax--bold
.punctuation.definition.italic => .syntax--punctuation.syntax--definition.syntax--italic
.punctuation.section.embedded => .syntax--punctuation.syntax--section.syntax--embedded
.support.class => .syntax--support.syntax--class
.support.function => .syntax--support.syntax--function
.support.function.any-method => .syntax--support.syntax--function.syntax--any-method
.entity.name.function => .syntax--entity.syntax--name.syntax--function
.entity.name.class, .entity.name.type.class => .syntax--entity.syntax--name.syntax--class, .syntax--entity.syntax--name.syntax--type.syntax--class
.entity.name.section => .syntax--entity.syntax--name.syntax--section
.entity.name.tag => .syntax--entity.syntax--name.syntax--tag
.entity.other.attribute-name => .syntax--entity.syntax--other.syntax--attribute-name
.entity.other.attribute-name.id => .syntax--entity.syntax--other.syntax--attribute-name.syntax--id
.meta.class => .syntax--meta.syntax--class
.meta.link => .syntax--meta.syntax--link
.meta.require => .syntax--meta.syntax--require
.meta.selector => .syntax--meta.syntax--selector
.meta.separator => .syntax--meta.syntax--separator
.none => .syntax--none
.markup.bold => .syntax--markup.syntax--bold
.markup.changed => .syntax--markup.syntax--changed
.markup.deleted => .syntax--markup.syntax--deleted
.markup.italic => .syntax--markup.syntax--italic
.markup.heading .punctuation.definition.heading => .syntax--markup.syntax--heading .syntax--punctuation.syntax--definition.syntax--heading
.markup.inserted => .syntax--markup.syntax--inserted
.markup.list => .syntax--markup.syntax--list
.markup.quote => .syntax--markup.syntax--quote
.markup.raw.inline => .syntax--markup.syntax--raw.syntax--inline
.source.gfm .markup => .syntax--source.syntax--gfm .syntax--markup
.source.gfm .markup.heading => .syntax--source.syntax--gfm .syntax--markup.syntax--heading
atom-text-editor[mini] .scroll-view, :host([mini]) .scroll-view => atom-text-editor[mini] .scroll-view,atom-text-editor .scroll-view
Automatic translation of selectors will be removed in a few release cycles to minimize startup time. Please, make sure to upgrade the above selectors as soon as possible.