A deck is read back with the title it has, and a theme takes its page from the master

content/command-line/theme.md

@@ -83,6 +83,9 @@ read is a failure here rather than a theme nobody can use.
 from the deck's slides where it is not. A deck made in a tool that does not do themes carries
 Office's palette without ever drawing in it, and that palette describes nothing on the page.
 
+**The page** is the deck's master — the page behind every slide that does not paint itself — and
+where the master names no colour of its own, the slides answer for it.
+
 **The type scale** is read off the deck's text, because a deck records a size for every
 paragraph rather than a scale. The title is the size most slides are headed in, the cover the
 largest type on the first slide, the body the size the prose is written at, and the heading
@@ -113,7 +116,7 @@ mdoffice theme: wrote the theme for "probe.pptx" into "/tmp/probe-theme".
   template.pptx the deck's 3 layouts, without its 2 slides
 
   colours
-    dk1        #0D1B2A   the background of the slides
+    dk1        #0D1B2A   the deck's master
     lt1        #F8FAFC   the type
     accent1    #00B4D8   the colour the deck draws with
     hlink      #00B4D8   the accent, as a link is drawn

content/presentation/index.md

@@ -230,7 +230,7 @@ echo (new PowerPointToMarkdown('deck.pptx', new Options(mediaDirectory: null)))-
 
 ```text
 ---
-title: "Untitled Presentation"
+title: "One"
 author: "markdown-office"
 ---
 
@@ -240,8 +240,10 @@ Text.
 ```
 
 The frontmatter carries what the deck said about itself — its title, its theme, its author and
-its description — because a deck's own properties are the only thing about it that is not on a
-slide. `save()` writes it to a file instead, and `read()` gives the slides back as a list.
+its description. The title is the deck's own where it has one, and the first slide's where it
+has not: PHPPresentation gives every deck the title `Untitled Presentation`, and that is its
+own default rather than a title somebody wrote. `save()` writes it to a file instead, and
+`read()` gives the slides back as a list.
 
 **The theme's name comes back; the theme does not.** The name travels into the `.pptx` and comes
 back out of it, so a deck read back into Markdown is drawn again in the theme it was drawn in.

tools/check-command-line.php

@@ -86,6 +86,7 @@
     'the themes page counted the colour aliases wrongly in capitals' => 'Four read-friendly aliases are accepted',
     'the themes page counted the style keys wrongly' => 'the thirteen style keys',
     'the themes page found a theme under the working directory' => '`<workingDirectory>/themes/<name>`',
+    'the theme page said the page of a deck came from its slides' => '#0D1B2A   the background of the slides',
     'the presentation page listed the layout roles twice' => 'The eight layout roles:',
     'the frontmatter table named a number of roles' => 'one of eight roles',
     'the presentation page said one exception sat beside InvalidInput' => 'One sits beside those two rather than under `InvalidInput`',