The detailed new feature description can be found at:

billboard.js 3.18.0: Arc annotations, per-group normalization & enhanced treemap labels (dev.to link)

• color: Fix color update on gradient (9d6d392), closes #4048
• data: Handle undefined values in total calculation (18a5b9b), closes #4073
• interaction: Fix data.onover call in touch event (5fe448c), closes #4076
• load: Update call sequence to be after data are unloaded (f9f4a86), closes #4052
• text: Fix multiline data labels vertial position (6b5580a), closes #4062
• text: Fix text alignment to center (9f2960d), closes #4081
• util: update sanitization function (#4085) (49e079c), closes #4078

• arc: Intent to ship Arc's annotation (c740a3b), closes #3602
• data: Intent to ship data.stack.normalize.perGroup (c879c25), closes #4060
• treemap: Enhance label formatter to include tile size (71c0d06), closes #4066

• util: update sanitization function (#4085) (49e079c), closes #4078

• color: Fix color update on gradient (9d6d392), closes #4048
• data: Handle undefined values in total calculation (18a5b9b), closes #4073
• interaction: Fix data.onover call in touch event (5fe448c), closes #4076
• load: Update call sequence to be after data are unloaded (f9f4a86), closes #4052
• text: Fix multiline data labels vertial position (6b5580a), closes #4062
• text: Fix text alignment to center (9f2960d), closes #4081

• arc: Intent to ship Arc's annotation (c740a3b), closes #3602
• data: Intent to ship data.stack.normalize.perGroup (c879c25), closes #4060
• treemap: Enhance label formatter to include tile size (71c0d06), closes #4066

• all: Enforce script sanitization (ffd9f6f), closes #4078

• all: Enforce on security vulnerability (c69320a), closes #4078

• worker: Exclude empty data ran on Worker thread (a2e0f6e), closes #4044

• load: Fix possible context loss (a40fd41), closes #4044

• axis: Fix axis text position (b9f491b), closes #4017
• worker: Exclude empty data ran on Worker thread (4fbc2e8), closes #4041 #4042

• axis: Intent to ship tick.inner (db1de3e), closes #4033
• data: Enhance data.labels.backgroundColors ran as function (0211d19), closes #4016
• label: Intent to ship label border (dd1d70e), closes #4021
• labels: Intent to ship data.labels.image (#4035) (487548a)

• api: Fix to return indexed categories (55c17c6), closes #3365
• axis: Fix axis text position (b9f491b), closes #4017
• bar: Fix stacking bar position on multiple xs (216da62), closes #3372

• axis: Intent to ship tick.inner (db1de3e), closes #4033
• data: Enhance data.labels.backgroundColors ran as function (0211d19), closes #4016
• label: Intent to ship label border (dd1d70e), closes #4021
• labels: Intent to ship data.labels.image (487548a), closes #4035

• area-range: Fix line drawn when combining Area Range with regions (4a86e55), closes #3982 #3983 - by @bradallen
• axis: adjust tick generation logic for rotated axes (67c54aa), closes #3991
• data: Filter nullish data from rendering (02939b8), closes #3973
• domain: handle NaN values in data label calculations (bdd3589), closes #3985
• types: update type definitions for elements (591f6a6), closes #3969
• zoom: maintain zoom state during chart resize (2da91de), closes #3992

• all: Refactor to improve runtime performance (#4012)

• axis: Enhance axis.evalTextSize per axis (7fa445e), closes #4002
• axis: Intent to ship axis' tick.culling.reverse (1496d91), closes #3967
• bar: Intent to ship bar.connectLine (7dd7200), closes #3988 #4000