Finally the Blogger
Thumbnail Can Support WEBP - This is the result of my imprisonment that I have
done for almost 4 weeks, hahaha ... (just kidding, so don't think so ...). An
inspiration finally stopped in my head for Blogger thumbnail solutions to
support WEBP.
The problem of presenting
images in the next-gen format that came from Blogger thumbnails when tested
using Pagespeed Insights and Lighthouse is still an unsolved case because
Blogger does not yet support the WEBP image format for thumbnails.
As for the picture posting,
it can already be good for AMP and for NON AMP
But finally I got a solution
for Blogger thumbnails to support WEBP with the help of Statically Imgpx and
Lazysizes.js . But this is still only for Non AMP, for AMP I have not got the
solution.
I made use of the Statically
Imgpx feature to change Blogger images to support WEBP by using Lazysizes.js to
change the URL of the image as well as to lazyload the image.
So with this, 2 problems in
Pagespeed Insights and Lighthouse can be resolved, namely Serve images in
next-gen formats and Defer offscreen images .
With Lazysizes.js, I changed
the Blogger image URL to the following by slightly modifying the script.
Original URL:
https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhHsEsekLgUqo8CoBKjSNqHYe5_HhhIxugsrQw4xoyg7YhZWGAPBatbdgiNybp7-OK_XzifiNyq2pKv36nwrhLM5OhbXABVZ_xV8MwO8Nc0rSsH4nIGggB-c-xm1W9FKehPG6uWU1qqARM/w600-h337-p-k-no-nu/Km6K4E05HjM.jpgModified Lazysizes URL and blogger thumbnail code:
https://cdn.statically.io/img/3.bp.blogspot.com/-WvjDGI4wI1Q/XSmKyEfpsuI/AAAAAAAADqc/GGdZ0RndJGc8xBTn3myp0THfQltQKK2vQCLcBGAs/w600-h337-p-k-no-nu/Km6K4E05HjM.jpg?format=webpIf you want to try it, please use the following codes.
Please save the Lazysizes.js
script that I have modified to change the Blogger image URL to Statically
Imgpx.
/*! lazysizes - v5.1.0 */
!function(a,b){var c=b(a,a.document);a.lazySizes=c,"object"==typeof module&&module.exports&&(module.exports=c)}("undefined"!=typeof window?window:{},function(a,b){"use strict";var c,d;if(function(){var b,c={lazyClass:"lazyload",loadedClass:"lazyloaded",loadingClass:"lazyloading",preloadClass:"lazypreload",errorClass:"lazyerror",autosizesClass:"lazyautosizes",srcAttr:"data-src",srcsetAttr:"data-srcset",sizesAttr:"data-sizes",minSize:40,customMedia:{},init:!0,expFactor:1.5,hFac:.8,loadMode:2,loadHidden:!0,ricTimeout:0,throttleDelay:125};d=a.lazySizesConfig||a.lazysizesConfig||{};for(b in c)b in d||(d[b]=c[b])}(),!b||!b.getElementsByClassName)return{init:function(){},cfg:d,noSupport:!0};var e=b.documentElement,f=a.Date,g=a.HTMLPictureElement,h="addEventListener",i="getAttribute",j=a[h],k=a.setTimeout,l=a.requestAnimationFrame||k,m=a.requestIdleCallback,n=/^picture$/i,o=["load","error","lazyincluded","_lazyloaded"],p={},q=Array.prototype.forEach,r=function(a,b){return p[b]||(p[b]=new RegExp("(\\s|^)"+b+"(\\s|$)")),p[b].test(a[i]("class")||"")&&p[b]},s=function(a,b){r(a,b)||a.setAttribute("class",(a[i]("class")||"").trim()+" "+b)},t=function(a,b){var c;(c=r(a,b))&&a.setAttribute("class",(a[i]("class")||"").replace(c," "))},u=function(a,b,c){var d=c?h:"removeEventListener";c&&u(a,b),o.forEach(function(c){a[d](c,b)})},v=function(a,d,e,f,g){var h=b.createEvent("Event");return e||(e={}),e.instance=c,h.initEvent(d,!f,!g),h.detail=e,a.dispatchEvent(h),h},w=function(b,c){var e;!g&&(e=a.picturefill||d.pf)?(c&&c.src&&!b[i]("srcset")&&b.setAttribute("srcset",c.src),e({reevaluate:!0,elements:[b]})):c&&c.src&&(b.src=c.src)},x=function(a,b){return(getComputedStyle(a,null)||{})[b]},y=function(a,b,c){for(c=c||a.offsetWidth;c<d.minSize&&b&&!a._lazysizesWidth;)c=b.offsetWidth,b=b.parentNode;return c},z=function(){var a,c,d=[],e=[],f=d,g=function(){var b=f;for(f=d.length?e:d,a=!0,c=!1;b.length;)b.shift()();a=!1},h=function(d,e){a&&!e?d.apply(this,arguments):(f.push(d),c||(c=!0,(b.hidden?k:l)(g)))};return h._lsFlush=g,h}(),A=function(a,b){return b?function(){z(a)}:function(){var b=this,c=arguments;z(function(){a.apply(b,c)})}},B=function(a){var b,c=0,e=d.throttleDelay,g=d.ricTimeout,h=function(){b=!1,c=f.now(),a()},i=m&&g>49?function(){m(h,{timeout:g}),g!==d.ricTimeout&&(g=d.ricTimeout)}:A(function(){k(h)},!0);return function(a){var d;(a=!0===a)&&(g=33),b||(b=!0,d=e-(f.now()-c),d<0&&(d=0),a||d<9?i():k(i,d))}},C=function(a){var b,c,d=99,e=function(){b=null,a()},g=function(){var a=f.now()-c;a<d?k(g,d-a):(m||e)(e)};return function(){c=f.now(),b||(b=k(g,d))}},D=function(){var g,l,m,o,p,y,D,F,G,H,I,J,K=/^img$/i,L=/^iframe$/i,M="onscroll"in a&&!/(gle|ing)bot/.test(navigator.userAgent),N=0,O=0,P=0,Q=-1,R=function(a){P--,(!a||P<0||!a.target)&&(P=0)},S=function(a){return null==J&&(J="hidden"==x(b.body,"visibility")),J||"hidden"!=x(a.parentNode,"visibility")&&"hidden"!=x(a,"visibility")},T=function(a,c){var d,f=a,g=S(a);for(F-=c,I+=c,G-=c,H+=c;g&&(f=f.offsetParent)&&f!=b.body&&f!=e;)(g=(x(f,"opacity")||1)>0)&&"visible"!=x(f,"overflow")&&(d=f.getBoundingClientRect(),g=H>d.left&&G<d.right&&I>d.top-1&&F<d.bottom+1);return g},U=function(){var a,f,h,j,k,m,n,p,q,r,s,t,u=c.elements;if((o=d.loadMode)&&P<8&&(a=u.length)){for(f=0,Q++;f<a;f++)if(u[f]&&!u[f]._lazyRace)if(!M||c.prematureUnveil&&c.prematureUnveil(u[f]))aa(u[f]);else if((p=u[f][i]("data-expand"))&&(m=1*p)||(m=O),r||(r=!d.expand||d.expand<1?e.clientHeight>500&&e.clientWidth>500?500:370:d.expand,c._defEx=r,s=r*d.expFactor,t=d.hFac,J=null,O<s&&P<1&&Q>2&&o>2&&!b.hidden?(O=s,Q=0):O=o>1&&Q>1&&P<6?r:N),q!==m&&(y=innerWidth+m*t,D=innerHeight+m,n=-1*m,q=m),h=u[f].getBoundingClientRect(),(I=h.bottom)>=n&&(F=h.top)<=D&&(H=h.right)>=n*t&&(G=h.left)<=y&&(I||H||G||F)&&(d.loadHidden||S(u[f]))&&(l&&P<3&&!p&&(o<3||Q<4)||T(u[f],m))){if(aa(u[f]),k=!0,P>9)break}else!k&&l&&!j&&P<4&&Q<4&&o>2&&(g[0]||d.preloadAfterLoad)&&(g[0]||!p&&(I||H||G||F||"auto"!=u[f][i](d.sizesAttr)))&&(j=g[0]||u[f]);j&&!k&&aa(j)}},V=B(U),W=function(a){var b=a.target;if(b._lazyCache)return void delete b._lazyCache;R(a),s(b,d.loadedClass),t(b,d.loadingClass),u(b,Y),v(b,"lazyloaded")},X=A(W),Y=function(a){X({target:a.target})},Z=function(a,b){try{a.contentWindow.location.replace(b)}catch(c){a.src=b}},$=function(a){var b,c=a[i](d.srcsetAttr).replace(/.*?:\/\//g,"https://cdn.statically.io/img/");(b=d.customMedia[a[i]("data-media")||a[i]("media")])&&a.setAttribute("media",b),c&&a.setAttribute("srcset",c)},_=A(function(a,b,c,e,f){var g,h,j,l,o,p;(o=v(a,"lazybeforeunveil",b)).defaultPrevented||(e&&(c?s(a,d.autosizesClass):a.setAttribute("sizes",e)),h=a[i](d.srcsetAttr),g=a[i](d.srcAttr).replace(/.*?:\/\//g,"//"),f&&(j=a.parentNode,l=j&&n.test(j.nodeName||"")),p=b.firesLoad||"src"in a&&(h||g||l),o={target:a},s(a,d.loadingClass),p&&(clearTimeout(m),m=k(R,2500),u(a,Y,!0)),l&&q.call(j.getElementsByTagName("source"),$),h?a.setAttribute("srcset",h):g&&!l&&(L.test(a.nodeName)?Z(a,g):a.src=g),f&&(h||l)&&w(a,{src:g})),a._lazyRace&&delete a._lazyRace,t(a,d.lazyClass),z(function(){var b=a.complete&&a.naturalWidth>1;p&&!b||(b&&s(a,"ls-is-cached"),W(o),a._lazyCache=!0,k(function(){"_lazyCache"in a&&delete a._lazyCache},9)),"lazy"==a.loading&&P--},!0)}),aa=function(a){if(!a._lazyRace){var b,c=K.test(a.nodeName),e=c&&(a[i](d.sizesAttr)||a[i]("sizes")),f="auto"==e;(!f&&l||!c||!a[i]("src")&&!a.srcset||a.complete||r(a,d.errorClass)||!r(a,d.lazyClass))&&(b=v(a,"lazyunveilread").detail,f&&E.updateElem(a,!0,a.offsetWidth),a._lazyRace=!0,P++,_(a,b,f,e,c))}},ba=C(function(){d.loadMode=3,V()}),ca=function(){3==d.loadMode&&(d.loadMode=2),ba()},da=function(){if(!l){if(f.now()-p<999)return void k(da,999);l=!0,d.loadMode=3,V(),j("scroll",ca,!0)}};return{_:function(){p=f.now(),c.elements=b.getElementsByClassName(d.lazyClass),g=b.getElementsByClassName(d.lazyClass+" "+d.preloadClass),j("scroll",V,!0),j("resize",V,!0),a.MutationObserver?new MutationObserver(V).observe(e,{childList:!0,subtree:!0,attributes:!0}):(e[h]("DOMNodeInserted",V,!0),e[h]("DOMAttrModified",V,!0),setInterval(V,999)),j("hashchange",V,!0),["focus","mouseover","click","load","transitionend","animationend"].forEach(function(a){b[h](a,V,!0)}),/d$|^c/.test(b.readyState)?da():(j("load",da),b[h]("DOMContentLoaded",V),k(da,2e4)),c.elements.length?(U(),z._lsFlush()):V()},checkElems:V,unveil:aa,_aLSL:ca}}(),E=function(){var a,c=A(function(a,b,c,d){var e,f,g;if(a._lazysizesWidth=d,d+="px",a.setAttribute("sizes",d),n.test(b.nodeName||""))for(e=b.getElementsByTagName("source"),f=0,g=e.length;f<g;f++)e[f].setAttribute("sizes",d);c.detail.dataAttr||w(a,c.detail)}),e=function(a,b,d){var e,f=a.parentNode;f&&(d=y(a,f,d),e=v(a,"lazybeforesizes",{width:d,dataAttr:!!b}),e.defaultPrevented||(d=e.detail.width)&&d!==a._lazysizesWidth&&c(a,f,e,d))},f=function(){var b,c=a.length;if(c)for(b=0;b<c;b++)e(a[b])},g=C(f);return{_:function(){a=b.getElementsByClassName(d.autosizesClass),j("resize",g)},checkElems:g,updateElem:e}}(),F=function(){!F.i&&b.getElementsByClassName&&(F.i=!0,E._(),D._())};return k(function(){d.init&&F()}),c={cfg:d,autoSizer:E,loader:D,init:F,uP:w,aC:s,rC:t,hC:r,fire:v,gW:y,rAF:z}});Then use the following code to display the homepage thumbnail thumbnail.
<b:if cond='data:post.thumbnailUrl'>
<picture>
<source expr:data-srcset='resizeImage(data:post.thumbnailUrl, 600, "16:9") + "?format=webp"' type='image/webp'/>
<source expr:data-srcset='resizeImage(data:post.thumbnailUrl, 600, "16:9")' type='image/jpg'/>
<img class='lazyload' expr:alt='data:post.title' expr:data-src='resizeImage(data:post.thumbnailUrl, 600, "16:9")' expr:title='data:post.title' height='9' src='data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAJAQMAAAAB5D5xAAAAA1BMVEUAAACnej3aAAAAAXRSTlMAQObYZgAAAApJREFUCNdjwA0AABsAAQrj5HwAAAAASUVORK5CYII=' width='16'/>
</picture>
</b:if>For popular posts:
<b:if cond='data:post.thumbnail'>
<div class='item-thumbnail'>
<picture>
<source expr:data-srcset='resizeImage(data:post.thumbnail, 138, "16:9") + "?format=webp"' type='image/webp'/>
<source expr:data-srcset='resizeImage(data:post.thumbnail, 138, "16:9")' type='image/jpg'/>
<img class='lazyload' expr:alt='data:post.title' expr:data-src='resizeImage(data:post.thumbnail, 138, "16:9")' expr:title='data:post.title' height='9' src='data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAJAQMAAAAB5D5xAAAAA1BMVEUAAACnej3aAAAAAXRSTlMAQObYZgAAAApJREFUCNdjwA0AABsAAQrj5HwAAAAASUVORK5CYII=' width='16'/>
</picture>
</div>
</b:if>
For the size and dimensions
of the image in the code above, please adjust to the needs of your blog.
Maybe someone asks, why use
the <picture> tag? Because until now not all browsers support WEBP image
format. With the <picture> tag, there we also provide a fallback image *
.jpg for browsers that don't support WEBP.
What I expect from Blogger,
can modify the blogger thumbnail code like to resizeImage so we can modify the
url for blogger image parameters.