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1 | // Copyright 2016 Google Inc.
2 | //
3 | // Licensed under the Apache License, Version 2.0 (the "License");
4 | // you may not use this file except in compliance with the License.
5 | // You may obtain a copy of the License at
6 | //
7 | // http://www.apache.org/licenses/LICENSE-2.0
8 | //
9 | // Unless required by applicable law or agreed to in writing, software
10 | // distributed under the License is distributed on an "AS IS" BASIS,
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 | // See the License for the specific language governing permissions and
13 | // limitations under the License.
14 |
15 | window.onload = function() {
16 | measureCssUnblockTime();
17 | };
18 |
19 |
20 | /**
21 | * Calculates the time duration between the responseEnd timing event and when
22 | * the CSS stops blocking rendering, then logs that value to the console.
23 | */
24 | function measureCssUnblockTime() {
25 | console.log('CSS', 'unblock', measureDuration('css:unblock'));
26 | }
27 |
28 |
29 | /**
30 | * Accepts a mark name and an optional reference point in the navigation timing
31 | * API and returns the time duration between the reference point and the last
32 | * mark (chronologically).
33 | * @param {string} mark The mark name.
34 | * @param {string=} opt_reference An optional reference point from the
35 | * navigation timing API. Defaults to 'responseEnd'.
36 | * @return {number} The time duration
37 | */
38 | function measureDuration(mark, opt_reference) {
39 | var reference = opt_reference || 'responseEnd';
40 | var name = reference + ':' + mark;
41 |
42 | // Clears any existing measurements with the same name.
43 | performance.clearMeasures(name);
44 |
45 | // Creates a new measurement from the reference point to the specified mark.
46 | // If more than one mark with this name exists, the most recent one is used.
47 | performance.measure(name, reference, mark);
48 |
49 | // Gets the value of the measurement just created.
50 | var measure = performance.getEntriesByName(name)[0];
51 |
52 | // Returns the measure duration.
53 | return measure.duration;
54 | }
55 |
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1 | // Copyright 2016 Google Inc.
2 | //
3 | // Licensed under the Apache License, Version 2.0 (the "License");
4 | // you may not use this file except in compliance with the License.
5 | // You may obtain a copy of the License at
6 | //
7 | // http://www.apache.org/licenses/LICENSE-2.0
8 | //
9 | // Unless required by applicable law or agreed to in writing, software
10 | // distributed under the License is distributed on an "AS IS" BASIS,
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 | // See the License for the specific language governing permissions and
13 | // limitations under the License.
14 |
15 | window.onload = function() {
16 | measureCssUnblockTime();
17 | measureWebfontPerfAndFailures();
18 | };
19 |
20 |
21 | /**
22 | * Calculates the time duration between the responseEnd timing event and when
23 | * the CSS stops blocking rendering, then logs that value to the console.
24 | */
25 | function measureCssUnblockTime() {
26 | console.log('CSS', 'unblock', measureDuration('css:unblock'));
27 | }
28 |
29 |
30 | /**
31 | * Creates a promise that is resolved once the web fonts are fully load or
32 | * is rejected if the fonts fail to load. The resolved callback calculates the
33 | * time duration between the responseEnd timing event and when the web fonts
34 | * are downloaded and active. If an error occurs loading the font, this fact
35 | * is logged to the console.
36 | */
37 | function measureWebfontPerfAndFailures() {
38 | new Promise(function(resolve, reject) {
39 | // The classes `wf-active` or `wf-inactive` are added to the
40 | // element once the fonts are loaded (or error).
41 | var loaded = /wf-(in)?active/.exec(document.documentElement.className);
42 | var success = loaded && !loaded[1]; // No "in" in the capture group.
43 | // If the fonts are already done loading, resolve immediately.
44 | // Otherwise resolve/reject in the active/inactive callbacks, respectively.
45 | if (loaded) {
46 | success ? resolve() : reject();
47 | }
48 | else {
49 | var originalAciveCallback = WebFontConfig.active;
50 | WebFontConfig.inactive = reject;
51 | WebFontConfig.active = function() {
52 | originalAciveCallback();
53 | resolve();
54 | };
55 | // In case the webfont.js script fails to load, always reject the
56 | // promise after the timeout amount.
57 | setTimeout(reject, WebFontConfig.timeout);
58 | }
59 | })
60 | .then(function() {
61 | console.log('Fonts', 'active', measureDuration('fonts:active'));
62 | })
63 | .catch(function() {
64 | console.error('Error loading web fonts')
65 | });
66 | }
67 |
68 |
69 | /**
70 | * Accepts a mark name and an optional reference point in the navigation timing
71 | * API and returns the time duration between the reference point and the last
72 | * mark (chronologically).
73 | * @param {string} mark The mark name.
74 | * @param {string=} opt_reference An optional reference point from the
75 | * navigation timing API. Defaults to 'responseEnd'.
76 | * @return {number} The time duration
77 | */
78 | function measureDuration(mark, opt_reference) {
79 | var reference = opt_reference || 'responseEnd';
80 | var name = reference + ':' + mark;
81 |
82 | // Clears any existing measurements with the same name.
83 | performance.clearMeasures(name);
84 |
85 | // Creates a new measurement from the reference point to the specified mark.
86 | // If more than one mark with this name exists, the most recent one is used.
87 | performance.measure(name, reference, mark);
88 |
89 | // Gets the value of the measurement just created.
90 | var measure = performance.getEntriesByName(name)[0];
91 |
92 | // Returns the measure duration.
93 | return measure.duration;
94 | }
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1 | // Copyright 2016 Google Inc.
2 | //
3 | // Licensed under the Apache License, Version 2.0 (the "License");
4 | // you may not use this file except in compliance with the License.
5 | // You may obtain a copy of the License at
6 | //
7 | // http://www.apache.org/licenses/LICENSE-2.0
8 | //
9 | // Unless required by applicable law or agreed to in writing, software
10 | // distributed under the License is distributed on an "AS IS" BASIS,
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 | // See the License for the specific language governing permissions and
13 | // limitations under the License.
14 |
15 | window.onload = function() {
16 | measureCssUnblockTime();
17 | measureWebfontPerfAndFailures();
18 | measureImagesVisibleTime();
19 | };
20 |
21 |
22 | /**
23 | * Calculates the time duration between the responseEnd timing event and when
24 | * the CSS stops blocking rendering, then logs that value to the console.
25 | */
26 | function measureCssUnblockTime() {
27 | console.log('CSS', 'unblock', measureDuration('css:unblock'));
28 | }
29 |
30 |
31 | /**
32 | * Creates a promise that is resolved once the web fonts are fully load or
33 | * is rejected if the fonts fail to load. The resolved callback calculates the
34 | * time duration between the responseEnd timing event and when the web fonts
35 | * are downloaded and active. If an error occurs loading the font, this fact
36 | * is logged to the console.
37 | */
38 | function measureWebfontPerfAndFailures() {
39 | new Promise(function(resolve, reject) {
40 | // The classes `wf-active` or `wf-inactive` are added to the
41 | // element once the fonts are loaded (or error).
42 | var loaded = /wf-(in)?active/.exec(document.documentElement.className);
43 | var success = loaded && !loaded[1]; // No "in" in the capture group.
44 | // If the fonts are already done loading, resolve immediately.
45 | // Otherwise resolve/reject in the active/inactive callbacks, respectively.
46 | if (loaded) {
47 | success ? resolve() : reject();
48 | }
49 | else {
50 | var originalAciveCallback = WebFontConfig.active;
51 | WebFontConfig.inactive = reject;
52 | WebFontConfig.active = function() {
53 | originalAciveCallback();
54 | resolve();
55 | };
56 | // In case the webfont.js script fails to load, always reject the
57 | // promise after the timeout amount.
58 | setTimeout(reject, WebFontConfig.timeout);
59 | }
60 | })
61 | .then(function() {
62 | console.log('Fonts', 'active', measureDuration('fonts:active'));
63 | })
64 | .catch(function() {
65 | console.error('Error loading web fonts')
66 | });
67 | }
68 |
69 |
70 | /**
71 | * Calculates the time duration between the responseEnd timing event and when
72 | * all images are loaded and visible on the page, then logs that value to the
73 | * console.
74 | */
75 | function measureImagesVisibleTime() {
76 | console.log('Images', 'visible', measureDuration('img:visible'));
77 | }
78 |
79 |
80 | /**
81 | * Accepts a mark name and an optional reference point in the navigation timing
82 | * API and returns the time duration between the reference point and the last
83 | * mark (chronologically).
84 | * @param {string} mark The mark name.
85 | * @param {string=} opt_reference An optional reference point from the
86 | * navigation timing API. Defaults to 'responseEnd'.
87 | * @return {number} The time duration
88 | */
89 | function measureDuration(mark, opt_reference) {
90 | var reference = opt_reference || 'responseEnd';
91 | var name = reference + ':' + mark;
92 |
93 | // Clears any existing measurements with the same name.
94 | performance.clearMeasures(name);
95 |
96 | // Creates a new measurement from the reference point to the specified mark.
97 | // If more than one mark with this name exists, the most recent one is used.
98 | performance.measure(name, reference, mark);
99 |
100 | // Gets the value of the measurement just created.
101 | var measure = performance.getEntriesByName(name)[0];
102 |
103 | // Returns the measure duration.
104 | return measure.duration;
105 | }
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1 | // Copyright 2016 Google Inc.
2 | //
3 | // Licensed under the Apache License, Version 2.0 (the "License");
4 | // you may not use this file except in compliance with the License.
5 | // You may obtain a copy of the License at
6 | //
7 | // http://www.apache.org/licenses/LICENSE-2.0
8 | //
9 | // Unless required by applicable law or agreed to in writing, software
10 | // distributed under the License is distributed on an "AS IS" BASIS,
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 | // See the License for the specific language governing permissions and
13 | // limitations under the License.
14 |
15 | window.onload = function() {
16 | measureCssUnblockTime();
17 | measureWebfontPerfAndFailures();
18 | measureImagesVisibleTime();
19 | measureJavaSciptExecutionTime();
20 | };
21 |
22 |
23 | /**
24 | * Calculates the time duration between the responseEnd timing event and when
25 | * the CSS stops blocking rendering, then logs that value to the console.
26 | */
27 | function measureCssUnblockTime() {
28 | console.log('CSS', 'unblock', measureDuration('css:unblock'));
29 | }
30 |
31 |
32 | /**
33 | * Creates a promise that is resolved once the web fonts are fully load or
34 | * is rejected if the fonts fail to load. The resolved callback calculates the
35 | * time duration between the responseEnd timing event and when the web fonts
36 | * are downloaded and active. If an error occurs loading the font, this fact
37 | * is logged to the console.
38 | */
39 | function measureWebfontPerfAndFailures() {
40 | new Promise(function(resolve, reject) {
41 | // The classes `wf-active` or `wf-inactive` are added to the
42 | // element once the fonts are loaded (or error).
43 | var loaded = /wf-(in)?active/.exec(document.documentElement.className);
44 | var success = loaded && !loaded[1]; // No "in" in the capture group.
45 | // If the fonts are already done loading, resolve immediately.
46 | // Otherwise resolve/reject in the active/inactive callbacks, respectively.
47 | if (loaded) {
48 | success ? resolve() : reject();
49 | }
50 | else {
51 | var originalAciveCallback = WebFontConfig.active;
52 | WebFontConfig.inactive = reject;
53 | WebFontConfig.active = function() {
54 | originalAciveCallback();
55 | resolve();
56 | };
57 | // In case the webfont.js script fails to load, always reject the
58 | // promise after the timeout amount.
59 | setTimeout(reject, WebFontConfig.timeout);
60 | }
61 | })
62 | .then(function() {
63 | console.log('Fonts', 'active', measureDuration('fonts:active'));
64 | })
65 | .catch(function() {
66 | console.error('Error loading web fonts')
67 | });
68 | }
69 |
70 |
71 | /**
72 | * Calculates the time duration between the responseEnd timing event and when
73 | * all images are loaded and visible on the page, then logs that value to the
74 | * console.
75 | */
76 | function measureImagesVisibleTime() {
77 | console.log('Images', 'visible', measureDuration('img:visible'));
78 | }
79 |
80 |
81 | /**
82 | * Calculates the time duration between the responseEnd timing event and when
83 | * all synchronous JavaScript files have been downloaded and executed, then
84 | * logs that value to the console.
85 | */
86 | function measureJavaSciptExecutionTime() {
87 | console.log('JavaScript', 'execute', measureDuration('js:execute'));
88 | }
89 |
90 |
91 | /**
92 | * Accepts a mark name and an optional reference point in the navigation timing
93 | * API and returns the time duration between the reference point and the last
94 | * mark (chronologically).
95 | * @param {string} mark The mark name.
96 | * @param {string=} opt_reference An optional reference point from the
97 | * navigation timing API. Defaults to 'responseEnd'.
98 | * @return {number} The time duration
99 | */
100 | function measureDuration(mark, opt_reference) {
101 | var reference = opt_reference || 'responseEnd';
102 | var name = reference + ':' + mark;
103 |
104 | // Clears any existing measurements with the same name.
105 | performance.clearMeasures(name);
106 |
107 | // Creates a new measurement from the reference point to the specified mark.
108 | // If more than one mark with this name exists, the most recent one is used.
109 | performance.measure(name, reference, mark);
110 |
111 | // Gets the value of the measurement just created.
112 | var measure = performance.getEntriesByName(name)[0];
113 |
114 | // Returns the measure duration.
115 | return measure.duration;
116 | }
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1 | // Copyright 2016 Google Inc.
2 | //
3 | // Licensed under the Apache License, Version 2.0 (the "License");
4 | // you may not use this file except in compliance with the License.
5 | // You may obtain a copy of the License at
6 | //
7 | // http://www.apache.org/licenses/LICENSE-2.0
8 | //
9 | // Unless required by applicable law or agreed to in writing, software
10 | // distributed under the License is distributed on an "AS IS" BASIS,
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 | // See the License for the specific language governing permissions and
13 | // limitations under the License.
14 |
15 | window.onload = function() {
16 | measureCssUnblockTime();
17 | measureWebfontPerfAndFailures();
18 | measureImagesVisibleTime();
19 | measureJavaSciptExecutionTime();
20 | };
21 |
22 |
23 | /**
24 | * Calculates the time duration between the responseEnd timing event and when
25 | * the CSS stops blocking rendering, then logs that value to the console.
26 | */
27 | function measureCssUnblockTime() {
28 | console.log('CSS', 'unblock', measureDuration('css:unblock'));
29 | }
30 |
31 |
32 | /**
33 | * Creates a promise that is resolved once the web fonts are fully load or
34 | * is rejected if the fonts fail to load. The resolved callback calculates the
35 | * time duration between the responseEnd timing event and when the web fonts
36 | * are downloaded and active. If an error occurs loading the font, this fact
37 | * is logged to the console.
38 | */
39 | function measureWebfontPerfAndFailures() {
40 | if (window.Promise) {
41 | new Promise(function(resolve, reject) {
42 | // The classes `wf-active` or `wf-inactive` are added to the
43 | // element once the fonts are loaded (or error).
44 | var loaded = /wf-(in)?active/.exec(document.documentElement.className);
45 | var success = loaded && !loaded[1]; // No "in" in the capture group.
46 | // If the fonts are already done loading, resolve immediately.
47 | // Otherwise resolve/reject in the active/inactive callbacks, respectively.
48 | if (loaded) {
49 | success ? resolve() : reject();
50 | }
51 | else {
52 | var originalAciveCallback = WebFontConfig.active;
53 | WebFontConfig.inactive = reject;
54 | WebFontConfig.active = function() {
55 | originalAciveCallback();
56 | resolve();
57 | };
58 | // In case the webfont.js script fails to load, always reject the
59 | // promise after the timeout amount.
60 | setTimeout(reject, WebFontConfig.timeout);
61 | }
62 | })
63 | .then(function() {
64 | console.log('Fonts', 'active', measureDuration('fonts:active'));
65 | })
66 | .catch(function() {
67 | console.error('Error loading web fonts')
68 | });
69 | }
70 | }
71 |
72 |
73 | /**
74 | * Calculates the time duration between the responseEnd timing event and when
75 | * all images are loaded and visible on the page, then logs that value to the
76 | * console.
77 | */
78 | function measureImagesVisibleTime() {
79 | console.log('Images', 'visible', measureDuration('img:visible'));
80 | }
81 |
82 |
83 | /**
84 | * Calculates the time duration between the responseEnd timing event and when
85 | * all synchronous JavaScript files have been downloaded and executed, then
86 | * logs that value to the console.
87 | */
88 | function measureJavaSciptExecutionTime() {
89 | console.log('JavaScript', 'execute', measureDuration('js:execute'));
90 | }
91 |
92 |
93 | /**
94 | * Accepts a mark name and an optional reference point in the navigation timing
95 | * API and returns the time duration between the reference point and the last
96 | * mark (chronologically).
97 | * @param {string} mark The mark name.
98 | * @param {string=} opt_reference An optional reference point from the
99 | * navigation timing API. Defaults to 'responseEnd'.
100 | * @return {?number} The time duration or undefined.
101 | */
102 | function measureDuration(mark, opt_reference) {
103 | if (window.__perf) {
104 | var reference = opt_reference || 'responseEnd';
105 | var name = reference + ':' + mark;
106 |
107 | // Clears any existing measurements with the same name.
108 | performance.clearMeasures(name);
109 |
110 | // Creates a new measurement from the reference point to the specified mark.
111 | // If more than one mark with this name exists, the most recent one is used.
112 | performance.measure(name, reference, mark);
113 |
114 | // Gets the value of the measurement just created.
115 | var measure = performance.getEntriesByName(name)[0];
116 |
117 | // Returns the measure duration.
118 | return measure.duration;
119 | }
120 | }
121 |
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1 | // Copyright 2016 Google Inc.
2 | //
3 | // Licensed under the Apache License, Version 2.0 (the "License");
4 | // you may not use this file except in compliance with the License.
5 | // You may obtain a copy of the License at
6 | //
7 | // http://www.apache.org/licenses/LICENSE-2.0
8 | //
9 | // Unless required by applicable law or agreed to in writing, software
10 | // distributed under the License is distributed on an "AS IS" BASIS,
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 | // See the License for the specific language governing permissions and
13 | // limitations under the License.
14 |
15 | window.onload = function() {
16 | measureCssUnblockTime();
17 | measureWebfontPerfAndFailures();
18 | measureImagesVisibleTime();
19 | measureJavaSciptExecutionTime();
20 | };
21 |
22 |
23 | /**
24 | * Calculates the time duration between the responseEnd timing event and when
25 | * the CSS stops blocking rendering, then sends this measurement to Google
26 | * Analytics via a timing hit.
27 | */
28 | function measureCssUnblockTime() {
29 | var cssUnblockTime = measureDuration('css:unblock');
30 | if (cssUnblockTime) {
31 | ga('send', 'timing', 'CSS', 'unblock', cssUnblockTime);
32 | }
33 | }
34 |
35 |
36 | /**
37 | * Creates a promise that is resolved once the web fonts are fully load or
38 | * is rejected if the fonts fail to load. The resolved callback calculates the
39 | * time duration between the responseEnd timing event and when the web fonts
40 | * are downloaded and active and since this measurement to Google Analytics.
41 | * If an error occurs loading the font, and error event is sent to Google
42 | * Analytics.
43 | */
44 | function measureWebfontPerfAndFailures() {
45 | if (window.Promise) {
46 | new Promise(function(resolve, reject) {
47 | var loaded = /wf-(in)?active/.exec(document.documentElement.className);
48 | var success = loaded && !loaded[1]; // No "in" in the capture group.
49 | if (loaded) {
50 | success ? resolve() : reject();
51 | }
52 | else {
53 | var originalAciveCallback = WebFontConfig.active;
54 | WebFontConfig.inactive = reject;
55 | WebFontConfig.active = function() {
56 | originalAciveCallback();
57 | resolve();
58 | };
59 | // In case the webfont.js script failed to load.
60 | setTimeout(reject, WebFontConfig.timeout);
61 | }
62 | })
63 | .then(function() {
64 | var fontsActiveTime = measureDuration('fonts:active');
65 | if (fontsActiveTime) {
66 | ga('send', 'timing', 'Fonts', 'active', fontsActiveTime);
67 | }
68 | })
69 | .catch(function() {
70 | ga('send', 'event', 'Fonts', 'error');
71 | });
72 | }
73 | }
74 |
75 |
76 | /**
77 | * Calculates the time duration between the responseEnd timing event and when
78 | * all images are loaded and visible on the page, then sends this measurement
79 | * to Google Analytics via a timing hit.
80 | */
81 | function measureImagesVisibleTime() {
82 | var imgVisibleTime = measureDuration('img:visible');
83 | if (imgVisibleTime) {
84 | ga('send', 'timing', 'Images', 'visible', imgVisibleTime);
85 | }
86 | }
87 |
88 |
89 | /**
90 | * Calculates the time duration between the responseEnd timing event and when
91 | * all synchronous JavaScript files are downloaded and executed, then sends
92 | * this measurement to Google Analytics via a timing hit.
93 | */
94 | function measureJavaSciptExecutionTime() {
95 | var jsExecuteTime = measureDuration('js:execute');
96 | if (jsExecuteTime) {
97 | ga('send', 'timing', 'JavaScript', 'execute', jsExecuteTime);
98 | }
99 | }
100 |
101 |
102 | /**
103 | * Accepts a mark name and an optional reference point in the navigation timing
104 | * API and returns the time duration between the reference point and the last
105 | * mark (chronologically). The return value is rounded to the nearest whole
106 | * number to be compatible with Google Analytics.
107 | * @param {string} mark The mark name.
108 | * @param {string=} opt_reference An optional reference point from the
109 | * navigation timing API. Defaults to 'responseEnd'.
110 | * @return {?number} The time duration rounded to the nearest millisecond
111 | * or undefined.
112 | */
113 | function measureDuration(mark, opt_reference) {
114 | if (window.__perf) {
115 | var reference = opt_reference || 'responseEnd';
116 | var name = reference + ':' + mark;
117 |
118 | // Clears any existing measurements with the same name.
119 | performance.clearMeasures(name);
120 |
121 | // Creates a new measurement from the reference point to the specified mark.
122 | // If more than one mark with this name exists, the most recent one is used.
123 | performance.measure(name, reference, mark);
124 |
125 | // Gets the value of the measurement just created.
126 | var measure = performance.getEntriesByName(name)[0];
127 |
128 | // Returns the measure duration.
129 | return Math.round(measure.duration);
130 | }
131 | }
132 |
--------------------------------------------------------------------------------
/CONTRIBUTING.md:
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1 | # How to become a contributor and submit your own code
2 |
3 | ## Contributor License Agreements
4 |
5 | We'd love to accept your patches! Before we can take them, we
6 | have to jump a couple of legal hurdles.
7 |
8 | ### Before you contribute
9 | Before we can use your code, you must sign the
10 | [Google Individual Contributor License Agreement](https://cla.developers.google.com/about/google-individual)
11 | (CLA), which you can do online. The CLA is necessary mainly because you own the
12 | copyright to your changes, even after your contribution becomes part of our
13 | codebase, so we need your permission to use and distribute your code. We also
14 | need to be sure of various other things—for instance that you'll tell us if you
15 | know that your code infringes on other people's patents. You don't have to sign
16 | the CLA until after you've submitted your code for review and a member has
17 | approved it, but you must do it before we can put your code into our codebase.
18 | Before you start working on a larger contribution, you should get in touch with
19 | us first through the issue tracker with your idea so that we can help out and
20 | possibly guide you. Coordinating up front makes it much easier to avoid
21 | frustration later on.
22 |
23 | ### Code reviews
24 | All submissions, including submissions by project members, require review. We
25 | use Github pull requests for this purpose.
26 |
27 | ### The small print
28 | Contributions made by corporations are covered by a different agreement than
29 | the one above, the
30 | [Software Grant and Corporate Contributor License Agreement](https://cla.developers.google.com/about/google-corporate).
31 |
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/README.md:
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1 | # Measuring Critical Performance Metrics with Google Analytics
2 |
3 | These are the resource files needed for the [Measuring Critical Performance Metrics with Google Analytics](https://codelabs.developers.google.com/codelabs/performance-analytics/)
4 | code lab from Google.
5 |
6 | Each step in the code lab corresponds to an individual directory in this repository, so you can easily skip to any step to see the complete code changes up through that point.
7 |
8 | This is a work in progress, if you find a mistake, please [file an issue](https://github.com/googlecodelabs/performance-analytics/issues). Thanks!
9 |
10 | ## What you’ll learn
11 |
12 | * How to accurately and effectively measure performance metrics using the User Timings API.
13 | * How to send that data to Google Analytics and report on it at a later time.
14 |
15 | ## What you’ll need
16 |
17 | * [Web Server for Chrome](https://chrome.google.com/webstore/detail/web-server-for-chrome/ofhbbkphhbklhfoeikjpcbhemlocgigb), or use your own web server of choice.
18 | * The [sample code](https://github.com/googlecodelabs/performance-analytics/archive/master.zip)
19 | * A text editor
20 | * (Optional) a Google Analytics account
21 |
--------------------------------------------------------------------------------
46 | 
47 | 
48 |