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Updated
These tests check whether user agents apply the basic Unicode Bidirectional Algorithm (UBA) to text. In particular they test isolation when using RLI, LRI, or FSI, ... PDI, and bracket balancing.
The Unicode Bidirectional Algorithm is responsible for arranging a sequence of mixed direction characters in memory (ordered undirectionally) into a bidirectional visual output. In doing so, it makes certain assumptions about the relationships between adjacent runs of opposite direction text. These assumptions don't always hold, and the Unicode formatting code points (RLI, etc.) provide hints to help in the process.
The formatting characters examined here all come in pairs (RLI/LRI/FSI ... PDI), and prevent the effects of the bidi algorithm interacting with content outside of the text they encompass. As an example: in a left-to-right page, such as this, a sequence of Hebrew or Arabic characters followed in memory by a number will by default position the number to the left of the Hebrew/Arabic, eg. Name & age: القاهرة, 43, rather than ordering items from left to right, as expected, ie. Name & age: القاهرة, 43. In plain text, the formatting characters RLI...PDI can be placed either side of the Arabic text to prevent this issue from arising. They do so by isolating the Arabic text from what surrounds it.
These tests check whether those formatting characters produce the expected effect.
Where the instructions tell you to look for red strokes, these strokes should be clearly discernable behind the black text of the test – ignore any anti-aliasing 'glow'.
| Links to run tests | Assertions | Gecko Firefox | Blink Chrome | Blink Edge | Webkit Safari | Legacy Edge |
|---|---|---|---|---|---|---|
| isolated from following number, opposite direction rli-lri-fsi-pdi-001a.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from a following number. | pass | pass | pass | pass | fail |
| isolated from following number, auto rli-lri-fsi-pdi-001b.html |
Plain text content surrounded by FSI...PDI is treated as a neutral character and directionally isolated from a following number. | pass | pass | pass | pass | fail |
| isolated from following number, same direction rli-lri-fsi-pdi-001c.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from a following number. | pass | pass | pass | pass | fail |
| isolated from following number with intervening neutrals, opposite direction rli-lri-fsi-pdi-002a.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from a following number. | pass | pass | pass | partial | fail |
| isolated from following number with intervening neutrals, auto rli-lri-fsi-pdi-002b.html |
Plain text content surrounded by FSI...PDI is treated as a neutral character and directionally isolated from a following number. | pass | pass | pass | pass | fail |
| isolated from following number with intervening neutrals, same direction rli-lri-fsi-pdi-002c.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from a following number. | pass | pass | pass | pass | fail |
| isolated from immediately following number, opposite direction rli-lri-fsi-pdi-003a.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and is directionally isolated from a following number, even with no intervening white space. | pass | pass | pass | pass | fail |
| isolated from immediately following number, auto rli-lri-fsi-pdi-003b.html |
Plain text content surrounded by FSI...PDI is treated as a neutral character and is directionally isolated from a following number, even with no intervening white space. | pass | pass | pass | pass | fail |
| isolated from immediately following number, same direction rli-lri-fsi-pdi-003c.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and is directionally isolated from a following number, even with no intervening white space. | pass | pass | pass | pass | fail |
Spec links for this table: link
| Links to run tests | Assertions | Gecko Firefox | Blink Chrome | Blink Edge | Webkit Safari | Legacy Edge |
|---|---|---|---|---|---|---|
| numbers isolated from preceding text, opposite direction rli-lri-fsi-pdi-004a.html |
Plain text numeric content content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from preceding text. | pass | pass | pass | pass | fail |
| numbers isolated from preceding text, auto rli-lri-fsi-pdi-004b.html |
Plain text numeric content content surrounded by FSI...PDI is treated as a neutral character and directionally isolated from preceding text. | pass | pass | pass | pass | fail |
| numbers isolated from preceding text, same direction rli-lri-fsi-pdi-004c.html |
Plain text numeric content content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from preceding text. | pass | pass | pass | pass | fail |
Spec links for this table: link
| Links to run tests | Assertions | Gecko Firefox | Blink Chrome | Blink Edge | Webkit Safari | Legacy Edge |
|---|---|---|---|---|---|---|
| isolated from following text, opposite direction rli-lri-fsi-pdi-005a.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from following text. | pass | pass | pass | pass | fail |
| isolated from following text, auto rli-lri-fsi-pdi-005b.html |
Plain text content surrounded by FSI...PDI is treated as a neutral character and directionally isolated from following text. | pass | pass | pass | pass | fail |
| isolated from following text, same direction rli-lri-fsi-pdi-005c.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from following text. | pass | pass | pass | pass | fail |
| isolated from following text with intervening neutrals, opposite direction rli-lri-fsi-pdi-006a.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from following text despite intervening neutrals. | pass | pass | pass | pass | fail |
| isolated from following text with intervening neutrals, auto rli-lri-fsi-pdi-006b.html |
Plain text content surrounded by FSI...PDI is treated as a neutral character and directionally isolated from following text despite intervening neutrals. | pass | pass | pass | pass | fail |
| isolated from following text with intervening neutrals, same direction rli-lri-fsi-pdi-006c.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from following text despite intervening neutrals. | pass | pass | pass | pass | fail |
| isolated from immediately following text, opposite direction rli-lri-fsi-pdi-007a.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from following text even with no intervening white space. | pass | pass | pass | pass | fail |
| isolated from immediately following text, auto rli-lri-fsi-pdi-007b.html |
Plain text content surrounded by FSI...PDI is treated as a neutral character and directionally isolated from following text even with no intervening white space. | pass | pass | pass | pass | fail |
| isolated from immediately following text, same direction rli-lri-fsi-pdi-007c.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from following text even with no intervening white space. | pass | pass | pass | pass | fail |
Spec links for this table: link
| Links to run tests | Assertions | Gecko Firefox | Blink Chrome | Blink Edge | Webkit Safari | Legacy Edge |
|---|---|---|---|---|---|---|
| isolated from preceding text, opposite direction rli-lri-fsi-pdi-008a.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from preceding text. | pass | pass | pass | pass | fail |
| isolated from preceding text, auto rli-lri-fsi-pdi-008b.html |
Plain text content surrounded by FSI...PDI is treated as a neutral character and directionally isolated from preceding text. | pass | pass | pass | pass | fail |
| isolated from preceding text, same direction rli-lri-fsi-pdi-008c.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from preceding text. | pass | pass | pass | pass | fail |
Spec links for this table: link
| Links to run tests | Assertions | Gecko Firefox | Blink Chrome | Blink Edge | Webkit Safari | Legacy Edge |
|---|---|---|---|---|---|---|
| isolated from surrounding text, opposite direction rli-lri-fsi-pdi-009a.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from surrounding text. | pass | pass | pass | pass | fail |
| isolated from surrounding text, auto rli-lri-fsi-pdi-009b.html |
Plain text content surrounded by FSI...PDI is treated as a neutral character and directionally isolated from surrounding text. | pass | pass | pass | pass | fail |
| isolated from surrounding text, same direction rli-lri-fsi-pdi-009c.html |
Plain text content surrounded by RLI/LRI...PDI is treated as a neutral character and directionally isolated from surrounding text. | pass | pass | pass | pass | fail |
Spec links for this table: link
| Links to run tests | Assertions | Gecko Firefox | Blink Chrome | Blink Edge | Webkit Safari | Legacy Edge |
|---|---|---|---|---|---|---|
| RTL base, ltr parens brackets-001.html |
The bidi algorithm will keep parentheses around Latin text at the boundary of two runs with a RTL base direction. | pass | pass | pass | fail | pass |
| RTL base, ltr square brackets brackets-002.html |
The bidi algorithm will keep square brackets around Latin text at the boundary of two runs with a RTL base direction. | pass | pass | pass | fail | pass |
| RTL base, ltr curly brackets brackets-003.html |
The bidi algorithm will keep curly brackets around Latin text at the boundary of two runs with a RTL base direction. | pass | pass | pass | fail | pass |
Spec links for this table: link
Dependencies
| Links to run tests | Assertions | Gecko Firefox | Blink Chrome | Blink Edge | Webkit Safari | Legacy Edge |
|---|---|---|---|---|---|---|
| RTL base, ltr mismatched parens brackets-010.html |
The bidi algorithm will NOT keep paired characters around Latin text at the boundary of two runs with a RTL base direction if the paired characters are not the same. | pass | pass | pass | fail | pass |
Spec links for this table: link
Thanks to the following people who submitted results: Lucas Werkmeister.