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Gathering detailed insights and metrics for lazy-loadable

lazy-loadable - 0.1.3 | npmpackage.info

lazy-loadable

A copy-past boilerplate for native lazy-load that works today.

0.1.3

MIT

JavaScript

6.66 kB

1.7

Installations

npm install lazy-loadable

Developer Guide

BETA

Typescript

No

Module System

ESM

Node Version

10.13.0

NPM Version

6.4.1 Pull Requests

Open

0

Total

0

Closed

0

Issues

Open

0

Total

0

Closed

0

Releases

Unable to fetch releases

Languages

JavaScript

JavaScript (100%)

Developer

manobi

Download Statistics

Total Downloads

Last Day

Last Week

Last Month

Last Year

GitHub Statistics

MIT License

17 Stars

44 Commits

2 Watchers

1 Branches

5 Contributors

Updated on Nov 25, 2019

Maintainers

View All 5 Contributors

Package Meta Information

Latest Version

0.1.3

Package Id

lazy-loadable@0.1.3

Unpacked Size

6.66 kB

Size

3.40 kB

File Count

NPM Version

6.4.1

Node Version

10.13.0

Total Downloads

Cumulative downloads

Total Downloads

NaN

Last Day

NaN

Compared to previous day

Last Week

NaN

Compared to previous week

Last Month

NaN

Compared to previous month

Last Year

NaN

Compared to previous year

Weekly Downloads

Monthly Downloads

Yearly Downloads

No dependencies detected.

Native lazy load boilerplate

🧱 Pollyfill for modern browsers
👵 Gracefully degrades for old browsers
🤖 Future proof markup
🚉 Using the platform

The whole idea is to create a copy-past boilerplate that works today. If by a miracle all browser vendors agree to ship "native lazy load", you would only have to change one place.

Boilerplate

1<img 
2    is="lazy-loadable" 
3    loading="lazy" 
4    lazyload="1" 
5    importance="low" 
6    srcset="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAEElEQVR42gEFAPr/AP///wAI/AL+Sr4t6gAAAABJRU5ErkJggg==" 
7    src="https://placekitten.com/400/400" 
8    width="400" 
9    height="400" 
10    alt=""
11>
12<script type="module">
13    import LazyLoadable from 'https://cdn.pika.dev/lazy-loadable';
14    customElements.define('lazy-loadable', LazyLoadable, { extends: "img" });
15</script>

Attributes breakdown

is="lazy-loadable"

Apply the lazy-loadable custom element pollyfill behaviour to your image tag. Usually people loop over all images on a page (querySelectorAll('img.lazy').forEach), to decide if it should lazy load, it can be very slow, you also have to wait until the DOM is ready or put your script at end of body, it would not work if a image appears in document after the document have loaded, like in infinity scrolling or lazy rendering. Using custom elements the browser handles all of it for you.

loading="lazy"

The native way to tell the browser to delay the image loading, until it's in the screen. Only Google Chrome have shipped it yet.

lazyload="1"

It seems Microsoft implemented on IE 11 and Edge 12 a unofficial attribute called "lazyload". But it does not work the same way as "loading=lazy", it only tell the browser to decrese the loading priority of the resource. Actually it's pretty similar to what "importance=low" does.

importance="low"

This is a spec proposal to enable developers to signal the priority of each resource they need to download. In case a browser vendor never implement the "native lazy load", but for any reason ships the priority hints support, we would at least download the image without high priority.

srcset Since there is no ways yet to know if the browser have native support before images starts loading we need to set a placeholder image.

Our placeholder is the one responsible for the magic. I've chosen to use srcset as placeholder instead of a infamous "data-src". By placing the placeholder on "srcattr", we can hold the "src" loading, until we are sure if the browser handles lazy by default. In future if all browsers support native lazy-load, all you would have to do is remove this attribute from your html.

The great advantage of using "srcattr" instead of "data-src" is that when you remove the placeholder, browsers already knows what to do, respecting the standard fallback src, picture source, media attributes and pixel density.

width & height Explicitally declare the image size to avoid page jumps.

Safari custom elements pollyfill

Apple have chosen to not ship a complete implementation of custom elements V1, in order for it to work in Safari you may have to use the ungap pollyfill before your scripts:

1<script>
2    if(this.customElements)
3    try{customElements.define('built-in',document.createElement('p').constructor,{'extends':'p'})}
4    catch(s){document.write('<script src="//unpkg.com/@ungap/custom-elements-builtin"><\x2fscript>')}
5    else
6    document.write('<script src="//unpkg.com/document-register-element"><\x2fscript>');
7</script>

Install

If you prefer to bundle the pollyfill yourself or use it with a framework:

1npm install lazy-loadable -s

1import LazyLoadable from 'lazy-loadable';
2customElements.define('lazy-loadable', LazyLoadable, { extends: "img" });

License

Distributed under the MIT license. See LICENSE for details.

No vulnerabilities found.

10

Binary-Artifacts

Determines if the project has generated executable (binary) artifacts in the source repository.

10

License

Determines if the project has defined a license.

0

Code-Review

Determines if the project requires human code review before pull requests (aka merge requests) are merged.

0

SAST

Determines if the project uses static code analysis.

0

Maintained

Determines if the project is "actively maintained".

0

CII-Best-Practices

Determines if the project has an OpenSSF (formerly CII) Best Practices Badge.

0

Security-Policy

Determines if the project has published a security policy.

0

Fuzzing

Determines if the project uses fuzzing.

0

Branch-Protection

Determines if the default and release branches are protected with GitHub's branch protection settings.

0

Vulnerabilities

Determines if the project has open, known unfixed vulnerabilities.

Reason

66 existing vulnerabilities detected

Details

Warn: Project is vulnerable to: GHSA-968p-4wvh-cqc8
Warn: Project is vulnerable to: GHSA-67hx-6x53-jw92
Warn: Project is vulnerable to: GHSA-6chw-6frg-f759
Warn: Project is vulnerable to: GHSA-v88g-cgmw-v5xw
Warn: Project is vulnerable to: GHSA-93q8-gq69-wqmw
Warn: Project is vulnerable to: GHSA-fwr7-v2mv-hh25
Warn: Project is vulnerable to: GHSA-qwcr-r2fm-qrc7
Warn: Project is vulnerable to: GHSA-v6h2-p8h4-qcjw
Warn: Project is vulnerable to: GHSA-grv7-fg5c-xmjg
Warn: Project is vulnerable to: GHSA-w8qv-6jwh-64r5
Warn: Project is vulnerable to: GHSA-pxg6-pf52-xh8x
Warn: Project is vulnerable to: GHSA-7gc6-qh9x-w6h8
Warn: Project is vulnerable to: GHSA-3xgq-45jj-v275
Warn: Project is vulnerable to: GHSA-gxpj-cx7g-858c
Warn: Project is vulnerable to: GHSA-w573-4hg7-7wgq
Warn: Project is vulnerable to: GHSA-j4f2-536g-r55m
Warn: Project is vulnerable to: GHSA-r7qp-cfhv-p84w
Warn: Project is vulnerable to: GHSA-3gx7-xhv7-5mx3
Warn: Project is vulnerable to: GHSA-2j2x-2gpw-g8fm
Warn: Project is vulnerable to: GHSA-74fj-2j2h-c42q
Warn: Project is vulnerable to: GHSA-pw2r-vq6v-hr8c
Warn: Project is vulnerable to: GHSA-jchw-25xp-jwwc
Warn: Project is vulnerable to: GHSA-cxjh-pqwp-8mfp
Warn: Project is vulnerable to: GHSA-8r6j-v8pm-fqw3
Warn: Project is vulnerable to: MAL-2023-462
Warn: Project is vulnerable to: GHSA-4q6p-r6v2-jvc5
Warn: Project is vulnerable to: GHSA-43f8-2h32-f4cj
Warn: Project is vulnerable to: GHSA-6x33-pw7p-hmpq
Warn: Project is vulnerable to: GHSA-qqgx-2p2h-9c37
Warn: Project is vulnerable to: GHSA-9c47-m6qq-7p4h
Warn: Project is vulnerable to: GHSA-7x7c-qm48-pq9c
Warn: Project is vulnerable to: GHSA-rc3x-jf5g-xvc5
Warn: Project is vulnerable to: GHSA-6c8f-qphg-qjgp
Warn: Project is vulnerable to: GHSA-jf85-cpcp-j695
Warn: Project is vulnerable to: GHSA-p6mc-m468-83gw
Warn: Project is vulnerable to: GHSA-29mw-wpgm-hmr9
Warn: Project is vulnerable to: GHSA-35jh-r3h4-6jhm
Warn: Project is vulnerable to: GHSA-82v2-mx6x-wq7q
Warn: Project is vulnerable to: GHSA-952p-6rrq-rcjv
Warn: Project is vulnerable to: GHSA-f8q6-p94x-37v3
Warn: Project is vulnerable to: GHSA-vh95-rmgr-6w4m
Warn: Project is vulnerable to: GHSA-xvch-5gv4-984h
Warn: Project is vulnerable to: GHSA-w7rc-rwvf-8q5r
Warn: Project is vulnerable to: GHSA-r683-j2x4-v87g
Warn: Project is vulnerable to: GHSA-6fx8-h7jm-663j
Warn: Project is vulnerable to: GHSA-hj48-42vr-x3v9
Warn: Project is vulnerable to: GHSA-g6ww-v8xp-vmwg
Warn: Project is vulnerable to: GHSA-hrpp-h998-j3pp
Warn: Project is vulnerable to: GHSA-c2qf-rxjj-qqgw
Warn: Project is vulnerable to: GHSA-fxwf-4rqh-v8g3
Warn: Project is vulnerable to: GHSA-25hc-qcg6-38wj
Warn: Project is vulnerable to: GHSA-xfhh-g9f5-x4m4
Warn: Project is vulnerable to: GHSA-qm95-pgcg-qqfq
Warn: Project is vulnerable to: GHSA-cqmj-92xf-r6r9
Warn: Project is vulnerable to: GHSA-3jfq-g458-7qm9
Warn: Project is vulnerable to: GHSA-r628-mhmh-qjhw
Warn: Project is vulnerable to: GHSA-9r2w-394v-53qc
Warn: Project is vulnerable to: GHSA-5955-9wpr-37jh
Warn: Project is vulnerable to: GHSA-qq89-hq3f-393p
Warn: Project is vulnerable to: GHSA-f5x3-32g6-xq36
Warn: Project is vulnerable to: GHSA-mgfv-m47x-4wqp
Warn: Project is vulnerable to: GHSA-3h5v-q93c-6h6q
Warn: Project is vulnerable to: GHSA-72mh-269x-7mh5
Warn: Project is vulnerable to: GHSA-h4j5-c7cj-74xg
Warn: Project is vulnerable to: GHSA-c4w7-xm78-47vh
Warn: Project is vulnerable to: GHSA-p9pc-299p-vxgp

Score

1.7

/10

Last Scanned on 2025-06-30

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