[DesignTheme] Tolerate blocked localStorage during startup by Copilot · Pull Request #4857 · microsoft/fluentui-blazor

Copilot · May 12, 2026

Pull Request

📖 Description

A SecurityError from localStorage during FluentUI startup could abort theme initialization early enough to prevent Fluent custom element registration. This change makes storage access non-fatal so blocked persistence degrades gracefully instead of breaking all Fluent web components on the page.

Theme storage hardening
- Route theme persistence through guarded storage access in ThemeStorage
- Fall back to in-memory storage when window.localStorage is unavailable or throws
- Treat read / write / remove failures as non-fatal
Bootstrap path hardening
- Replace direct localStorage.getItem(...) usage in loading-theme.js with safe storage reads
- Ignore and clear invalid persisted theme payloads instead of breaking startup
Resulting behavior
- Theme persistence becomes best-effort
- fluent-design-theme registration and downstream Fluent element registration continue even when browser privacy settings block storage

try {
  const storage = window.localStorage;
  return storage == null ? memoryStorage : storage;
} catch {
  return memoryStorage;
}

🎫 Issues

Handle browser SecurityError from localStorage during FluentUI startup/theme initialization.

👩‍💻 Reviewer Notes

Focus review on the two storage entry points:
- src/Core.Assets/src/Design/ThemeStorage.ts
- src/Core/wwwroot/js/loading-theme.js
Recommended smoke test:
- simulate a blocked window.localStorage
- verify customElements.get("fluent-design-theme") is defined
- verify pages still render upgraded Fluent components

📑 Test Plan

Manual browser repro with window.localStorage forced to throw SecurityError during startup
Core library build validation
Existing core unit-test suite was exercised; unrelated pre-existing failures remain outside this change scope

✅ Checklist

General

I have added tests for my changes.
I have tested my changes.
I have updated the project documentation to reflect my changes.
I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

I have added a new component
I have added Unit Tests for my new component
I have modified an existing component
I have validated the Unit Tests for an existing component

⏭ Next Steps

Consider consolidating the guarded storage fallback into a shared JS utility if more startup paths need the same behavior.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

accounts.google.com
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --use-angle=swiftshader-webgl --crashpad-handler-pid=6562 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/com.google.Chrome.scoped_dir.Fpqg3l --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,7650420327376008183,8944856811589620878,262144 --disable-features=PaintHolding --variations-seed-version --pseudonymization-salt-handle=7,i,9974608442809264542,17704172690964978898,4 --trace-process-track-uuid=3190708989122997041 (dns block)
- Triggering command: /opt/google/chrome/chrome /usr/bin/google-chrome --headless --disable-gpu --no-sandbox --virtual-time-budget=5000 --dump-dom REDACTED (dns block)
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --use-angle=swiftshader-webgl --crashpad-handler-pid=6715 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/com.google.Chrome.scoped_dir.V7svss --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,6199369688436918274,3489501208979327526,262144 --disable-features=PaintHolding --variations-seed-version --pseudonymization-salt-handle=7,i,2236751553720916477,7698183581020163837,4 --trace-process-track-uuid=3190708989122997041 (dns block)
clients2.google.com
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --use-angle=swiftshader-webgl --crashpad-handler-pid=6562 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/com.google.Chrome.scoped_dir.Fpqg3l --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,7650420327376008183,8944856811589620878,262144 --disable-features=PaintHolding --variations-seed-version --pseudonymization-salt-handle=7,i,9974608442809264542,17704172690964978898,4 --trace-process-track-uuid=3190708989122997041 (dns block)
- Triggering command: /opt/google/chrome/chrome /usr/bin/google-chrome --headless --disable-gpu --no-sandbox --virtual-time-budget=5000 --dump-dom REDACTED (dns block)
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --use-angle=swiftshader-webgl --crashpad-handler-pid=6715 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/com.google.Chrome.scoped_dir.V7svss --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,6199369688436918274,3489501208979327526,262144 --disable-features=PaintHolding --variations-seed-version --pseudonymization-salt-handle=7,i,2236751553720916477,7698183581020163837,4 --trace-process-track-uuid=3190708989122997041 (dns block)
clientservices.googleapis.com
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --use-angle=swiftshader-webgl --crashpad-handler-pid=6562 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/com.google.Chrome.scoped_dir.Fpqg3l --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,7650420327376008183,8944856811589620878,262144 --disable-features=PaintHolding --variations-seed-version --pseudonymization-salt-handle=7,i,9974608442809264542,17704172690964978898,4 --trace-process-track-uuid=3190708989122997041 (dns block)
- Triggering command: /opt/google/chrome/chrome /usr/bin/google-chrome --headless --disable-gpu --no-sandbox --virtual-time-budget=5000 --dump-dom REDACTED (dns block)
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --use-angle=swiftshader-webgl --crashpad-handler-pid=6715 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/com.google.Chrome.scoped_dir.V7svss --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,6199369688436918274,3489501208979327526,262144 --disable-features=PaintHolding --variations-seed-version --pseudonymization-salt-handle=7,i,2236751553720916477,7698183581020163837,4 --trace-process-track-uuid=3190708989122997041 (dns block)
redirector.gvt1.com
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --use-angle=swiftshader-webgl --crashpad-handler-pid=6562 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/com.google.Chrome.scoped_dir.Fpqg3l --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,7650420327376008183,8944856811589620878,262144 --disable-features=PaintHolding --variations-seed-version --pseudonymization-salt-handle=7,i,9974608442809264542,17704172690964978898,4 --trace-process-track-uuid=3190708989122997041 (dns block)
- Triggering command: /opt/google/chrome/chrome /usr/bin/google-chrome --headless --disable-gpu --no-sandbox --virtual-time-budget=5000 --dump-dom REDACTED (dns block)
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --use-angle=swiftshader-webgl --crashpad-handler-pid=6715 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/com.google.Chrome.scoped_dir.V7svss --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,6199369688436918274,3489501208979327526,262144 --disable-features=PaintHolding --variations-seed-version --pseudonymization-salt-handle=7,i,2236751553720916477,7698183581020163837,4 --trace-process-track-uuid=3190708989122997041 (dns block)
safebrowsingohttpgateway.googleapis.com
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --use-angle=swiftshader-webgl --crashpad-handler-pid=6562 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/com.google.Chrome.scoped_dir.Fpqg3l --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,7650420327376008183,8944856811589620878,262144 --disable-features=PaintHolding --variations-seed-version --pseudonymization-salt-handle=7,i,9974608442809264542,17704172690964978898,4 --trace-process-track-uuid=3190708989122997041 (dns block)
- Triggering command: /opt/google/chrome/chrome /usr/bin/google-chrome --headless --disable-gpu --no-sandbox --virtual-time-budget=5000 --dump-dom REDACTED (dns block)
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --use-angle=swiftshader-webgl --crashpad-handler-pid=6715 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/com.google.Chrome.scoped_dir.V7svss --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,6199369688436918274,3489501208979327526,262144 --disable-features=PaintHolding --variations-seed-version --pseudonymization-salt-handle=7,i,2236751553720916477,7698183581020163837,4 --trace-process-track-uuid=3190708989122997041 (dns block)
www.google.com
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --use-angle=swiftshader-webgl --crashpad-handler-pid=6562 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/com.google.Chrome.scoped_dir.Fpqg3l --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,7650420327376008183,8944856811589620878,262144 --disable-features=PaintHolding --variations-seed-version --pseudonymization-salt-handle=7,i,9974608442809264542,17704172690964978898,4 --trace-process-track-uuid=3190708989122997041 (dns block)
- Triggering command: /opt/google/chrome/chrome /usr/bin/google-chrome --headless --disable-gpu --no-sandbox --virtual-time-budget=5000 --dump-dom REDACTED (dns block)
- Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --use-angle=swiftshader-webgl --crashpad-handler-pid=6715 --enable-crash-reporter=, --noerrdialogs --user-data-dir=/tmp/com.google.Chrome.scoped_dir.V7svss --change-stack-guard-on-fork=enable --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,6199369688436918274,3489501208979327526,262144 --disable-features=PaintHolding --variations-seed-version --pseudonymization-salt-handle=7,i,2236751553720916477,7698183581020163837,4 --trace-process-track-uuid=3190708989122997041 (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Configure Actions setup steps to set up my environment, which run before the firewall is enabled
Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Agent-Logs-Url: https://github.com/microsoft/fluentui-blazor/sessions/cb041476-1c5d-4a67-a06e-46d15d131caa Co-authored-by: vnbaaij <1761079+vnbaaij@users.noreply.github.com>

github-actions · May 12, 2026

✅ All tests passed successfully

Details on your Workflow / Core Tests page.

github-actions · May 12, 2026

Summary - Unit Tests Code Coverage

Summary


Generated on:	5/12/2026 - 8:30:13 PM
Coverage date:	5/12/2026 - 8:30:03 PM
Parser:	Cobertura
Assemblies:	1
Classes:	258
Files:	368
Line coverage:	61.2% (6315 of 10313)
Covered lines:	6315
Uncovered lines:	3998
Coverable lines:	10313
Total lines:	34707
Branch coverage:	53.5% (3204 of 5985)
Covered branches:	3204
Total branches:	5985
Method coverage:	Feature is only available for sponsors
Tag:	6309_25760118126

Coverage

Microsoft.FluentUI.AspNetCore.Components - 61.2%

Name	Line	Branch
Microsoft.FluentUI.AspNetCore.Components	61.2%	53.5%
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Microsoft.FluentUI.AspNetCore.Components.ActionButton`1	50%
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Microsoft.FluentUI.AspNetCore.Components.CalendarExtended	95%	86.6%
Microsoft.FluentUI.AspNetCore.Components.CalendarTitles	87%	76.6%
Microsoft.FluentUI.AspNetCore.Components.CheckboxChangeEventArgs	50%
Microsoft.FluentUI.AspNetCore.Components.ColumnBase`1	26.2%	20.8%
Microsoft.FluentUI.AspNetCore.Components.ColumnKeyGridSort`1	0%	0%
Microsoft.FluentUI.AspNetCore.Components.ColumnOptionsLabels	100%
Microsoft.FluentUI.AspNetCore.Components.ColumnResizeLabels	100%
Microsoft.FluentUI.AspNetCore.Components.ColumnResizeOptions`1	0%	0%
Microsoft.FluentUI.AspNetCore.Components.ColumnSortLabels	100%
Microsoft.FluentUI.AspNetCore.Components.CommunicationToast	0%	0%
Microsoft.FluentUI.AspNetCore.Components.CommunicationToastContent	0%
Microsoft.FluentUI.AspNetCore.Components.ComponentParameters	16.6%	0%
Microsoft.FluentUI.AspNetCore.Components.Components.DateTime.RangeOfDates	100%	50%
Microsoft.FluentUI.AspNetCore.Components.Components.Tooltip.TooltipGlobalOp tions	40%
Microsoft.FluentUI.AspNetCore.Components.Components.Tooltip.TooltipOptions	0%
Microsoft.FluentUI.AspNetCore.Components.Components.Tooltip.TooltipService	57.5%	30%
Microsoft.FluentUI.AspNetCore.Components.ConfirmationToast	0%
Microsoft.FluentUI.AspNetCore.Components.CountdownTimer	0%	0%
Microsoft.FluentUI.AspNetCore.Components.CustomEmoji	0%	0%
Microsoft.FluentUI.AspNetCore.Components.CustomIcon	0%
Microsoft.FluentUI.AspNetCore.Components.DataGrid.Infrastructure.AsyncQuery ExecutorSupplier	38.4%	50%
Microsoft.FluentUI.AspNetCore.Components.DataGrid.Infrastructure.ColumnsCol lectedNotifier`1	87.5%	50%
Microsoft.FluentUI.AspNetCore.Components.DataGrid.Infrastructure.Defer	100%
Microsoft.FluentUI.AspNetCore.Components.DataGrid.Infrastructure.DisplayAtt ributeExtensions	66.6%	50%
Microsoft.FluentUI.AspNetCore.Components.DataGrid.Infrastructure.InternalGr idContext`1	90.4%	100%
Microsoft.FluentUI.AspNetCore.Components.DataGridCellFocusEventArgs	0%
Microsoft.FluentUI.AspNetCore.Components.DataGridRowFocusEventArgs	0%
Microsoft.FluentUI.AspNetCore.Components.DataGridSortEventArgs`1	0%
Microsoft.FluentUI.AspNetCore.Components.DialogEventArgs	0%
Microsoft.FluentUI.AspNetCore.Components.DialogHelper	0%
Microsoft.FluentUI.AspNetCore.Components.DialogInstance	86.6%	75%
Microsoft.FluentUI.AspNetCore.Components.DialogParameters	91.1%	100%
Microsoft.FluentUI.AspNetCore.Components.DialogParameters`1	100%
Microsoft.FluentUI.AspNetCore.Components.DialogReference	36.3%	37.5%
Microsoft.FluentUI.AspNetCore.Components.DialogResult	0%	0%
Microsoft.FluentUI.AspNetCore.Components.DialogService	4.1%	2.6%
Microsoft.FluentUI.AspNetCore.Components.Emoji	0%	0%
Microsoft.FluentUI.AspNetCore.Components.EmojiCompress	0%	0%
Microsoft.FluentUI.AspNetCore.Components.EmojiExtensions	0%	0%
Microsoft.FluentUI.AspNetCore.Components.EmojiInfo	0%
Microsoft.FluentUI.AspNetCore.Components.Extensions.AdditionalAttributesExt ensions	100%	100%
Microsoft.FluentUI.AspNetCore.Components.Extensions.BooleanExtensions	100%	100%
Microsoft.FluentUI.AspNetCore.Components.Extensions.DateTimeExtensions	81.2%	85%
Microsoft.FluentUI.AspNetCore.Components.Extensions.EnumExtensions	70.5%	59%
Microsoft.FluentUI.AspNetCore.Components.Extensions.FluentInputExtensions	28.5%	33.3%
Microsoft.FluentUI.AspNetCore.Components.Extensions.UrlFormatterExtensions	100%	75%
Microsoft.FluentUI.AspNetCore.Components.FluentAccessibilityStatus	0%	0%
Microsoft.FluentUI.AspNetCore.Components.FluentAccordion	59.2%	0%
Microsoft.FluentUI.AspNetCore.Components.FluentAccordionItem	83.7%	63.6%
Microsoft.FluentUI.AspNetCore.Components.FluentAnchor	90%	67.8%
Microsoft.FluentUI.AspNetCore.Components.FluentAnchoredRegion	87.7%	60%
Microsoft.FluentUI.AspNetCore.Components.FluentAppBar	64.6%	42.1%
Microsoft.FluentUI.AspNetCore.Components.FluentAppBarItem	80.5%	42.8%
Microsoft.FluentUI.AspNetCore.Components.FluentAutocomplete`1	85.7%	71.8%
Microsoft.FluentUI.AspNetCore.Components.FluentBadge	100%	100%
Microsoft.FluentUI.AspNetCore.Components.FluentBodyContent	100%
Microsoft.FluentUI.AspNetCore.Components.FluentBreadcrumb	100%
Microsoft.FluentUI.AspNetCore.Components.FluentBreadcrumbItem	100%	100%
Microsoft.FluentUI.AspNetCore.Components.FluentButton	84.3%	64.5%
Microsoft.FluentUI.AspNetCore.Components.FluentCalendar	83.4%	77.4%
Microsoft.FluentUI.AspNetCore.Components.FluentCalendarBase	94.1%	81.2%
Microsoft.FluentUI.AspNetCore.Components.FluentCalendarDay	100%	100%
Microsoft.FluentUI.AspNetCore.Components.FluentCalendarMonth	92.3%	64.2%
Microsoft.FluentUI.AspNetCore.Components.FluentCalendarYear	84.6%	58.3%
Microsoft.FluentUI.AspNetCore.Components.FluentCard	100%	100%
Microsoft.FluentUI.AspNetCore.Components.FluentCheckbox	91.1%	87%
Microsoft.FluentUI.AspNetCore.Components.FluentCollapsibleRegion	100%	100%
Microsoft.FluentUI.AspNetCore.Components.FluentCombobox`1	69%	57.6%
Microsoft.FluentUI.AspNetCore.Components.FluentComponentBase	90.9%	50%
Microsoft.FluentUI.AspNetCore.Components.FluentCounterBadge	92.3%	84.8%
Microsoft.FluentUI.AspNetCore.Components.FluentDataGrid`1	55.4%	49.2%
Microsoft.FluentUI.AspNetCore.Components.FluentDataGridCell`1	80%	73.9%
Microsoft.FluentUI.AspNetCore.Components.FluentDataGridRow`1	56.2%	37.5%
Microsoft.FluentUI.AspNetCore.Components.FluentDatePicker	81.8%	53.7%
Microsoft.FluentUI.AspNetCore.Components.FluentDesignSystemProvider	100%	50%
Microsoft.FluentUI.AspNetCore.Components.FluentDesignTheme	0%	0%
Microsoft.FluentUI.AspNetCore.Components.FluentDialog	57.3%	60%
Microsoft.FluentUI.AspNetCore.Components.FluentDialogBody	100%
Microsoft.FluentUI.AspNetCore.Components.FluentDialogFooter	66.6%	44.1%
Microsoft.FluentUI.AspNetCore.Components.FluentDialogHeader	85.1%	75%
Microsoft.FluentUI.AspNetCore.Components.FluentDialogProvider	59.2%	57.1%
Microsoft.FluentUI.AspNetCore.Components.FluentDivider	86.9%	100%
Microsoft.FluentUI.AspNetCore.Components.FluentDragContainer`1	71.4%
Microsoft.FluentUI.AspNetCore.Components.FluentDragEventArgs`1	0%
Microsoft.FluentUI.AspNetCore.Components.FluentDropZone`1	22.2%	4.3%
Microsoft.FluentUI.AspNetCore.Components.FluentEditForm	100%	100%
Microsoft.FluentUI.AspNetCore.Components.FluentEmoji`1	0%	0%
Microsoft.FluentUI.AspNetCore.Components.FluentFlipper	100%
Microsoft.FluentUI.AspNetCore.Components.FluentFooter	100%
Microsoft.FluentUI.AspNetCore.Components.FluentGrid	72.2%	50%
Microsoft.FluentUI.AspNetCore.Components.FluentGridItem	87.5%	82.5%
Microsoft.FluentUI.AspNetCore.Components.FluentHeader	100%
Microsoft.FluentUI.AspNetCore.Components.FluentHighlighter	80%	20%
Microsoft.FluentUI.AspNetCore.Components.FluentHorizontalScroll	60.6%	20%
Microsoft.FluentUI.AspNetCore.Components.FluentIcon`1	88.3%	81.2%
Microsoft.FluentUI.AspNetCore.Components.FluentInputBase`1	72.5%	64.8%
Microsoft.FluentUI.AspNetCore.Components.FluentInputFile	90%	79.6%
Microsoft.FluentUI.AspNetCore.Components.FluentInputFileBuffer	100%
Microsoft.FluentUI.AspNetCore.Components.FluentInputFileEventArgs	92.3%
Microsoft.FluentUI.AspNetCore.Components.FluentInputLabel	100%	100%
Microsoft.FluentUI.AspNetCore.Components.FluentKeyCode	88.6%	90%
Microsoft.FluentUI.AspNetCore.Components.FluentKeyCodeEventArgs	100%	75%
Microsoft.FluentUI.AspNetCore.Components.FluentKeyCodeProvider	40%	0%
Microsoft.FluentUI.AspNetCore.Components.FluentLabel	98%	88.8%
Microsoft.FluentUI.AspNetCore.Components.FluentLayout	100%	100%
Microsoft.FluentUI.AspNetCore.Components.FluentListbox`1	94.4%	83.3%
Microsoft.FluentUI.AspNetCore.Components.FluentMain	100%
Microsoft.FluentUI.AspNetCore.Components.FluentMainLayout	100%	100%
Microsoft.FluentUI.AspNetCore.Components.FluentMenu	60.4%	51.3%
Microsoft.FluentUI.AspNetCore.Components.FluentMenuButton	73.1%	25%
Microsoft.FluentUI.AspNetCore.Components.FluentMenuItem	74%	41.6%
Microsoft.FluentUI.AspNetCore.Components.FluentMenuProvider	95.2%	83.3%
Microsoft.FluentUI.AspNetCore.Components.FluentMessageBar	48.7%	23.9%
Microsoft.FluentUI.AspNetCore.Components.FluentMessageBarProvider	70.4%	59%
Microsoft.FluentUI.AspNetCore.Components.FluentMultiSplitter	81.7%	66.6%
Microsoft.FluentUI.AspNetCore.Components.FluentMultiSplitterEventArgs	100%
Microsoft.FluentUI.AspNetCore.Components.FluentMultiSplitterPane	97.1%	91%
Microsoft.FluentUI.AspNetCore.Components.FluentMultiSplitterResizeEventArgs	100%
Microsoft.FluentUI.AspNetCore.Components.FluentNavBase	55.1%	16.6%
Microsoft.FluentUI.AspNetCore.Components.FluentNavGroup	60.9%	34.3%
Microsoft.FluentUI.AspNetCore.Components.FluentNavLink	55.2%	40.6%
Microsoft.FluentUI.AspNetCore.Components.FluentNavMenu	61.1%	33.3%
Microsoft.FluentUI.AspNetCore.Components.FluentNavMenuGroup	0%	0%
Microsoft.FluentUI.AspNetCore.Components.FluentNavMenuItemBase	0%	0%
Microsoft.FluentUI.AspNetCore.Components.FluentNavMenuLink	0%	0%
Microsoft.FluentUI.AspNetCore.Components.FluentNavMenuTree	0%	0%
Microsoft.FluentUI.AspNetCore.Components.FluentNumberField`1	63.8%	55.1%
Microsoft.FluentUI.AspNetCore.Components.FluentOption`1	80%	61.5%
Microsoft.FluentUI.AspNetCore.Components.FluentOverflow	0%	0%
Microsoft.FluentUI.AspNetCore.Components.FluentOverflowItem	0%	0%
Microsoft.FluentUI.AspNetCore.Components.FluentOverlay	74%	62%
Microsoft.FluentUI.AspNetCore.Components.FluentPageScript	100%
Microsoft.FluentUI.AspNetCore.Components.FluentPaginator	68.5%	72.2%
Microsoft.FluentUI.AspNetCore.Components.FluentPersona	100%	78.1%
Microsoft.FluentUI.AspNetCore.Components.FluentPopover	79.1%	77.7%
Microsoft.FluentUI.AspNetCore.Components.FluentPresenceBadge	60.9%	29.1%
Microsoft.FluentUI.AspNetCore.Components.FluentProfileMenu	100%	100%
Microsoft.FluentUI.AspNetCore.Components.FluentProgress	81.2%	68.1%
Microsoft.FluentUI.AspNetCore.Components.FluentProgressRing	97.6%	92.8%
Microsoft.FluentUI.AspNetCore.Components.FluentPullToRefresh	94%	89.2%
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…AspNetCore.Components.Icons (#6497) Updated [Microsoft.FluentUI.AspNetCore.Components](https://github.com/microsoft/fluentui-blazor) from 4.14.0 to 4.14.2. <details> <summary>Release notes</summary> _Sourced from [Microsoft.FluentUI.AspNetCore.Components's releases](https://github.com/microsoft/fluentui-blazor/releases)._ ## 4.14.2 ## What's Changed * [Select] Fix selected items color by @MarvinKlein1508 in microsoft/fluentui-blazor#4760 * [DesignTheme] Tolerate blocked localStorage during startup by @Copilot in microsoft/fluentui-blazor#4857 * [Chore] Prep for release and update icons by @vnbaaij in microsoft/fluentui-blazor#4869 **Full Changelog**: microsoft/fluentui-blazor@v4.14.1...v4.14.2 ## 4.14.1 ## What's Changed * Merge changes from Main by @vnbaaij in microsoft/fluentui-blazor#4516 * [AppBar] Make OnClick close popover by @vnbaaij in microsoft/fluentui-blazor#4518 * [Docs] Update keycode docs to reflect latest interface by @MarvinKlein1508 in microsoft/fluentui-blazor#4522 * Fix index.ts section causing "Illegal constructor" on older iOS devices by @GusPietrasanta-Polygon in microsoft/fluentui-blazor#4531 * [Docs] Add note about render mode and required interactivity by @MarvinKlein1508 in microsoft/fluentui-blazor#4540 * [Tabs] Call HandleOnTabChange when changing to a tab through the menu by @vnbaaij in microsoft/fluentui-blazor#4564 * [Popover] Allow tabbing inside open anchored regions, support keyboard accessible navigation for popover by @adamint in microsoft/fluentui-blazor#4561 * [DataGrid] Add OnSortChanged event callback by @vnbaaij in microsoft/fluentui-blazor#4573 * [Templates] Fix 404 in WebAssembly temp by @vnbaaij in microsoft/fluentui-blazor#4578 * Bump minimatch from 3.1.2 to 3.1.5 in /src/Core.Assets by @dependabot[bot] in microsoft/fluentui-blazor#4586 * fix: rename `dateselected` custom event to `fluentdateselected` to resolve .NET 11 exception by @Copilot in microsoft/fluentui-blazor#4605 * fix: rename custom events matching browserEventName to use fluent prefix by @Copilot in microsoft/fluentui-blazor#4609 * [General] Add accent-color in reboot.css by @wherewhere in microsoft/fluentui-blazor#4614 * [Dialog] Update docs by @vnbaaij in microsoft/fluentui-blazor#4625 * [DataGrid] Fix SelectedItems getting unselected when using pagination (and virtualization) by @vnbaaij in microsoft/fluentui-blazor#4623 * Bump flatted from 3.3.1 to 3.4.2 in /src/Core.Assets by @dependabot[bot] in microsoft/fluentui-blazor#4638 * [Docs] Fix incorrect Icon in search after Navigation by @sebbogle in microsoft/fluentui-blazor#4641 * [SplashScreen] Mark sync methods as Obsolete by @MarvinKlein1508 in microsoft/fluentui-blazor#4644 * Bump picomatch from 2.3.1 to 2.3.2 in /src/Core.Assets by @dependabot[bot] in microsoft/fluentui-blazor#4646 * [NavGroup] Fix disabled state for top-level `FluentNavGroup` by @MarvinKlein1508 in microsoft/fluentui-blazor#4647 * [NavGroup] Apply font opacity instead of color by @MarvinKlein1508 in microsoft/fluentui-blazor#4648 * Rollup PRs #4677 and and #4678 by @vnbaaij in microsoft/fluentui-blazor#4680 ## New Contributors * @GusPietrasanta-Polygon made their first contribution in microsoft/fluentui-blazor#4531 * @sebbogle made their first contribution in microsoft/fluentui-blazor#4641 **Full Changelog**: microsoft/fluentui-blazor@v4.14.0...v4.14.1 Commits viewable in [compare view](microsoft/fluentui-blazor@v4.14.0...v4.14.2). </details> Updated [Microsoft.FluentUI.AspNetCore.Components.Icons](https://github.com/microsoft/fluentui-blazor) from 4.14.2 to 4.14.3. <details> <summary>Release notes</summary> _Sourced from [Microsoft.FluentUI.AspNetCore.Components.Icons's releases](https://github.com/microsoft/fluentui-blazor/releases)._ ## 4.14.3 ## What's Changed * [Chore] Publish symbols from CI builds to internal symbol server by @tlmii in microsoft/fluentui-blazor#4910 * [Chore] Update dependencies in package.json by @dvoituron in microsoft/fluentui-blazor#4946 * [Docs] Update link to v5 docs by @MarvinKlein1508 in microsoft/fluentui-blazor#4927 * Update icons and prep for release by @vnbaaij in microsoft/fluentui-blazor#4958 **Full Changelog**: microsoft/fluentui-blazor@v4.14.2...v4.14.3 Commits viewable in [compare view](microsoft/fluentui-blazor@v4.14.2...v4.14.3). </details> Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. [//]: # (dependabot-automerge-start) [//]: # (dependabot-automerge-end) --- <details> <summary>Dependabot commands and options</summary> <br /> You can trigger Dependabot actions by commenting on this PR: - `@dependabot rebase` will rebase this PR - `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it - `@dependabot show <dependency name> ignore conditions` will show all of the ignore conditions of the specified dependency - `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself) </details> --------- Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com> Co-authored-by: Djuradj Kurepa <dkurepa@microsoft.com>

Initial plan

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Copilot AI assigned Copilot and vnbaaij May 12, 2026

Copilot AI requested review from Copilot and removed request for Copilot May 12, 2026 20:11

Copilot started work on behalf of vnbaaij May 12, 2026 20:11 View session

Copilot AI linked an issue May 12, 2026 that may be closed by this pull request

localStorage SecurityError during script init prevents customElements.define for all FluentUI elements #4761

Closed

fix: tolerate blocked localStorage during theme startup

d0baaed

Agent-Logs-Url: https://github.com/microsoft/fluentui-blazor/sessions/cb041476-1c5d-4a67-a06e-46d15d131caa Co-authored-by: vnbaaij <1761079+vnbaaij@users.noreply.github.com>

Copilot AI requested review from Copilot and removed request for Copilot May 12, 2026 20:18

refactor: simplify localStorage fallback access

7988792

Agent-Logs-Url: https://github.com/microsoft/fluentui-blazor/sessions/cb041476-1c5d-4a67-a06e-46d15d131caa Co-authored-by: vnbaaij <1761079+vnbaaij@users.noreply.github.com>

Copilot AI requested review from Copilot and removed request for Copilot May 12, 2026 20:19

refactor: make storage fallback branch explicit

8a5049f

Agent-Logs-Url: https://github.com/microsoft/fluentui-blazor/sessions/cb041476-1c5d-4a67-a06e-46d15d131caa Co-authored-by: vnbaaij <1761079+vnbaaij@users.noreply.github.com>

Copilot AI requested review from Copilot and removed request for Copilot May 12, 2026 20:21

style: tidy storage fallback helpers

fe467c9

Agent-Logs-Url: https://github.com/microsoft/fluentui-blazor/sessions/cb041476-1c5d-4a67-a06e-46d15d131caa Co-authored-by: vnbaaij <1761079+vnbaaij@users.noreply.github.com>

Copilot AI requested review from Copilot and removed request for Copilot May 12, 2026 20:22

refactor: reuse theme storage payload type

22a3220

Agent-Logs-Url: https://github.com/microsoft/fluentui-blazor/sessions/cb041476-1c5d-4a67-a06e-46d15d131caa Co-authored-by: vnbaaij <1761079+vnbaaij@users.noreply.github.com>

Copilot AI requested review from Copilot and removed request for Copilot May 12, 2026 20:24

Copilot AI changed the title ~~[WIP] Fix localStorage SecurityError during script init for FluentUI elements~~ [DesignTheme] Tolerate blocked localStorage during startup May 12, 2026

Copilot AI requested a review from vnbaaij May 12, 2026 20:26

Copilot finished work on behalf of vnbaaij May 12, 2026 20:26

vnbaaij approved these changes May 12, 2026

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vnbaaij marked this pull request as ready for review May 12, 2026 20:44

vnbaaij requested a review from dvoituron as a code owner May 12, 2026 20:44

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[DesignTheme] Tolerate blocked localStorage during startup - #4857

[DesignTheme] Tolerate blocked localStorage during startup#4857
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