# theme validation happens at build stage
The `text` theme element must be a <element_text> object.
---
Theme element `text` must have class <element_text>
# incorrect theme specifications throw meaningful errors
Problem merging the `line` theme element
Caused by error in `merge_element()`:
! Only elements of the same class can be merged
---
Theme element `line` must have class <element_line>
---
Theme element `test` has "NULL" property without default: fill, colour, linewidth, and linetype
# element tree can be modified
The `blablabla` theme element is not defined in the element hierarchy.
---
The `blablabla` theme element must be a character or numeric vector.
---
The `blablabla` theme element must be a <unit> object.
---
The `blablabla` theme element must be a <element_text> object.
# Theme elements are checked during build
`plot.title.position` should be either "\"panel\"" or "\"plot\"".
---
`plot.caption.position` should be either "\"panel\"" or "\"plot\"".
---
`plot.tag.position` should be a coordinate or one of "topleft", "top", "topright", "left", "right", "bottomleft", "bottom", or "bottomright"
Generated by dwww version 1.15 on Sat Jun 15 21:36:58 CEST 2024.