Start time Expected observation
00:00:00:10 At approx 10 frames, a series of text subtitles with varying sizes and fonts begins to appear, with background colors as shown (note that the color values need not exactly match those shown) and character colors in white:
Start
Start by
Start by adding
Start by adding one
Start by adding one word
Start by adding one word at
Start by adding one word at a
Start by adding one word at a time.
Overall the change in wording and font is seamless and even, without gaps.
00:00:01:11 A new series of five subtitles begins to appear with the same text in white characters and a sequence of changing background colors:
Repeated subtitle with different background colors.
Overall the change in colors is smooth.
00:00:03:19 A new series of five text subtitles with varying sizes and formatting begins to appear, in all black characters:
Another short subtitle with small text.
A small-text subtitle that is fairly short.
Large text.
Overall the change in wording and format is consistent with what the subtitles indicate.
00:00:04:23 A new series of five text subtitles with varying sizes and formatting begins to appear, in all black characters:

Small text subtitles flash by fast.
These subtitles have gaps between them.
There should have been a gap between the previous subtitle and this subtitle.
Another gap preceded this subtitle.

Overall the change in wording and format is consistent with what the subtitles indicate.
00:00:07:05 A new series of five subtitles begins to appear:

This is a large subtitle. using a large font.
This subtitle uses a large font and a number of inline styles such as italic and bold.

Black characters:
This subtitle uses a small font and a lot of inline styles such as italic and bold.

White characters:
This subtitle makes much use of the <span> attribute, and should be difficult to render correctly.

Black characters:
This subtitle uses a large font, a number of inline styles, and many <span> elements.

Overall the change in wording and format is consistent with what the subtitles indicate.
00:00:13:04 A new series of two subtitles begins to appear:
Black characters:
A simple subtitle in a medium-sized font that uses a number of characters that may show up in a subtitle, such as ‘ ( ) & % ! @ # $ % ^ * _ - + = : ;

White characters:
A subtitle in a medium-sized font that uses a number of "special" characters such as ‘ ( ) & % ! @ # $ % ^ * _ - + = : ;

Overall the change in wording and format is consistent with what the subtitles indicate.
00:00:16:20 A new series of two subtitles begins to appear in all black characters:

This is a subtitle that has a very large number of characters in order to test text wrapping and general formatting of text. It even has multiple sentences to make it longer, which will help test the rendering of text-based subtitles in more extreme cases.
This is another subtitle that has a very large number of characters, primarily so that the previous long subtitle might be displayed long enough that someone could possibly be able to read it. This subtitle also has multiple sentences in order to lengthen it appropriately. The rendering rate for text subtitles is quite high, especially if only using text and not using a number of background colors.

Overall the change in wording and format is consistent with what the subtitles indicate.
00:00:23:20 A new series of two subtitles begins to appear in all white characters:

This subtitle uses number of different background colors for each layer, including the <div>, <p>, and several <span> elements.
This subtitle uses number of different background colors for each layer, including the <div>, <p>, and several <span> elements. In addition to rendering different background colors, this subtitle has a large number of characters. This subtitle is the same as the previous subtitle, but in a small font. When using a small font on a large region, an author could use a lot of characters.

Overall the change in wording and format is consistent with what the subtitles indicate.