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+# Semantic conventions for browser events
+
+**Status**: [Experimental](../../../document-status.md)
+
+<details>
+<summary>Table of Contents</summary>
+<!-- Re-generate TOC with `markdown-toc --no-first-h1 -i` -->
+
+<!-- toc -->
+
+- [Events](#events)
+  * [PageView](#pageview)
+  * [PageNavigationTiming](#pagenavigationtiming)
+  * [ResourceTiming](#resourcetiming)
+  * [Exception](#exception)
+  * [UserAction](#useraction)
+  * [WebVital](#webvital)
+
+<!-- tocstop -->
+
+</details>
+
+This document describes the semantic conventions for browser events.
+
+## Events
+
+The events may be represented either as Span Events or Log Events.
+
+All events have the following three high-level attributes. The event name is specified at the beginning of each section below. The payload of the event goes in an attribute called `event.data` of whose value is of type `map`. The contents of the `event.data` map for each event is listed in the sections below.
+
+| Key  | Type | Description  | Examples  | Requirement Level |
+|---|---|---|---|---|
+| `event.domain` | string | Fixed value: browser ||Required|
+| `event.name` | string | Described in each section below||Required|
+| `event.data` | map | A map of key/value pairs, with the keys for each event described in following sections||Recommended|
+
+### PageView
+
+**Event name**:  `page_view`.
+
+| Attribute  | Type | Description  | Examples  | Requirement Level |
+|---|---|---|---|---|
+| `referrer` | string | Referring Page URI (`document.referrer`) whenever available. | `https://en.wikipedia.org/wiki/Main_Page` | Recommended |
+| `type` | int | Browser page type | `0` | Required |
+| `title` | string | Page title DOM property | `Shopping cart page` | Recommended |
+| `url` [1] | string | Full HTTP request URL in the form `scheme://host[:port]/path?query[#fragment]`. Usually the fragment is not transmitted over HTTP, but if it is known, it should be included nevertheless. [2] | `https://en.wikipedia.org/wiki/Main_Page`; `https://en.wikipedia.org/wiki/Main_Page#foo` | Required |
+| `changeState` | string | Type of state change used for the virtual page navigation | `pushState`, `replaceState` | Recommended |
+
+**[1]:**  Alias for [`http.url`](../../../trace/semantic_conventions/http.md)
+**[2]:** The URL fragment may be included for virtual pages
+
+`type` MUST be one of the following:
+
+| Value  | Description |
+|---|---|
+| `0` | physical_page - Initial page load within the browser and will generally also precede a PageNavigationTiming event.|
+| `1` | virtual_page - This is for Single Page Applications (SPA) where the framework provides the ability to perform client side only page "navigation", the exact definition of what a virtual page change is determined by the SPA and the framework it is using.|
+
+<details>
+<summary>Sample PageView Event</summary>
+
+```json
+    "log_record": {
+        "timeUnixNano":"1581452773000000789",
+        "attributes": [
+        {
+            "key": "event.domain",
+            "value": {
+            "stringValue": "browser"
+            }
+        },
+        {
+            "key": "event.name",
+            "value": {
+            "stringValue": "page_view"
+            }
+        },
+
+        {
+            "key": "event.data",
+            "value": {
+                "kvlistValue": [
+                    {
+                        "key": "type",
+                        "value": {
+                        "intValue": "0"
+                        }
+                    },
+                    {
+                        "key": "url",
+                        "value": {
+                        "stringValue": "https://www.guidgenerator.com/online-guid-generator.aspx"
+                        }
+                    },
+                    {
+                        "key": "referrer",
+                        "value": {
+                        "stringValue": "https://wwww.google.com"
+                        }
+                    },
+                    {
+                        "key": "title",
+                        "value": {
+                        "stringValue": "Free Online GUID Generator"
+                        }
+                    },
+                ]
+            }
+        }
+        ]
+    }
+```
+
+</details>
+
+### PageNavigationTiming
+
+**Event name**:`page_navigation_timing`
+
+This event describes the timing metrics of a page navigation as provided by
+`PerformanceNavigationTiming` Performance API.
+
+| Key  | Type | Description  | Examples  | Requirement Level |
+|---|---|---|---|---|
+| name | string | URL of the page || Recommended |
+| fetchStart | long | || Recommended |
+| unloadEventStart | long | || Recommended |
+| unloadEventEnd | long | || Recommended |
+| domInteractive | long | || Recommended |
+| domContentLoadedEventStart | long | || Recommended |
+| domContentLoadedEventEnd | long | || Recommended |
+| domComplete | long | || Recommended |
+| loadEventStart | long | || Recommended |
+| loadEventEnd | long | || Recommended |
+| firstPaint | long | || Recommended |
+| firstContentfulPaint | long | || Recommended |
+
+### ResourceTiming
+
+**Event name**:`resource_timing`
+
+This event describes the timing metrics as provided by `PerformanceResourceTiming`
+Performance API.  These metrics are related to fetching a resource, such as
+XMLHttpRequest, Fetch, sendBeacon APIs, SVG, image or script.
+
+| Key  | Type | Description  | Examples  | Requirement Level |
+|---|---|---|---|---|
+|name | string | URL of the requested resource || Recommended |
+|fetchStart | long | || Recommended |
+|domainLookupStart | long | || Recommended |
+|domainLookupEnd | long | || Recommended |
+|connectStart | long | || Recommended |
+|secureConnectionStart | long | || Recommended |
+|connectEnd | long | || Recommended |
+|requestStart | long | || Recommended |
+|responseStart | long | || Recommended |
+|responseEnd | long | || Recommended |
+
+### Exception
+
+**Event name**:`exception`
+
+| Attribute  | Type | Description  | Examples  | Requirement Level |
+|---|---|---|---|---|
+| `exception.file_name` | string | Name of the file that generated the error | `foo.js` | Recommended |
+| `exception.line_number` | int | Line number where the error occurred |  | Recommended |
+| `exception.column_number` | int | Column number where the error occurred |  | Recommended |
+| `exception.message` | string | The exception message. | `Division by zero`; `Can't convert 'int' object to str implicitly` | Recommended |
+| `exception.stacktrace` | string | A stacktrace as a string in the natural representation for the language runtime. The representation is to be determined and documented by each language SIG. | `Exception in thread "main" java.lang.RuntimeException: Test exception\n at com.example.GenerateTrace.methodB(GenerateTrace.java:13)\n at com.example.GenerateTrace.methodA(GenerateTrace.java:9)\n at com.example.GenerateTrace.main(GenerateTrace.java:5)` | Recommended |
+| `exception.type` | string | The type of the exception (its fully-qualified class name, if applicable). The dynamic type of the exception should be preferred over the static type in languages that support it. | `java.net.ConnectException`; `OSError` | Recommended |
+
+### UserAction
+
+**Event name**:`user_action`
+
+This event describes actions performed by the user such as click, scroll, zoom, resize, etc.
+
+| Attribute  | Type | Description  | Examples  | Requirement Level |
+|---|---|---|---|---|
+| `element` | string | Target element tag name (obtained via `event.target.tagName`) | `button` | Recommended |
+| `element_xpath` | string | Target element xpath | `//*[@id="testBtn"]` | Recommended |
+| `user_action_type` | string | Type of interaction. See enum [here](https://github.com/microsoft/ApplicationInsights-JS/blob/941ec2e4dbd017b8450f2b17c60088ead1e6c428/extensions/applicationinsights-clickanalytics-js/src/Enums.ts) for potential values we could add support for. | `click` | Required |
+| `click_coordinates` | string | Click coordinates captured as a string in the format {x}X{y}.  Eg. 345X23 | `345X23` | Recommended |
+| `tags` | string[] | Grab data from data-otel-* attributes in tree | `[data-otel-asd="value" -> asd attr w/ "value"]` | Recommended |
+
+`user_action_type` MUST be one of the following:
+
+| Value  | Description |
+|---|---|
+| `click` | click |
+
+### WebVital
+
+**Event name**:`web_vital`
+
+This event describes the website performance metrics introduced by Google (See <https://web.dev/vitals/>).
+
+| Attribute  | Type | Description  | Examples  | Requirement Level |
+|---|---|---|---|---|
+| `name` | string | name of the web vital | `CLS` | Required |
+| `value` | double | value of the web vital | `1.0`; `2.0` | Required |
+| `delta` | double | The delta between the current value and the last-reported value | `0.2` | Required |
+| `id` | string | A unique ID representing this particular metric instance | "v3-1677874579383-6381583661209" | Required |
+
+`name` has the following list of well-known values. If one of them applies, then the respective value MUST be used, otherwise a custom value MAY be used.
+
+| Value  | Description |
+|---|---|
+| `CLS` | Cumulative Layout Shift |
+| `LCP` | Largest Contentful Paint |
+| `FID` | First Input Delay |