Finally the Blogger Thumbnail Can Support WEBP
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 doesn't yet support the WEBP image format for thumbnails.
As for the picture posting, it can already be good for AMP and for NON AMP. You can refer to the post about how to convert Blogger images into WebP for amp-img and WebP images on Non-AMP Blogger posts .
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://imgcdn.000webhostapp.com/https/3.bp.blogspot.com/9f9605a4279fc03cb70a53a9b6505a69.jpeg Modified Lazysizes URL and blogger thumbnail code:
https://cdn.statically.io/img/imgcdn.000webhostapp.com/https/3.bp.blogspot.com/9f9605a4279fc03cb70a53a9b6505a69.jpeg?format=webpFor the demo, please try saving the thumbnail image on the homepage post and the popular thumbnail post with the Chrome browser on the following demo blog, the image will be saved in the WEBP format later.
And the following test results on Pagespeed Insights, for the problem of format and image defer can be overcome.
If 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 */
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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}},$=function(a){var b,c=a[i](d.srcsetAttr) 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b,c=K.test(a.nodeName),e=c&&(a[i](d.sizesAttr)||a[i]("sizes")),f="auto"==e;(!f&&l||!c||!a[i]("src")&&!a.srcset||a.complete||r(a,d.errorClass)||!r(a,d.lazyClass))&&(b=v(a,"lazyunveilread").detail,f&&E.updateElem(a,!0,a.offsetWidth),a._lazyRace=!0,P++,_(a,b,f,e,c))}},ba=C(function(){d.loadMode=3,V()}),ca=function(){3==d.loadMode&&(d.loadMode=2),ba()},da=function(){if(!l){if(f.now()-p<999)return void k(da,999);l=!0,d.loadMode=3,V(),j("scroll",ca,!0)}};return{_:function(){p=f.now(),c.elements=b.getElementsByClassName(d.lazyClass),g=b.getElementsByClassName(d.lazyClass+" "+d.preloadClass),j("scroll",V,!0),j("resize",V,!0),a.MutationObserver?new MutationObserver(V).observe(e,{childList:!0,subtree:!0,attributes:!0}):(e[h]("DOMNodeInserted",V,!0),e[h]("DOMAttrModified",V,!0),setInterval(V,999)),j("hashchange",V,!0),["focus","mouseover","click","load","transitionend","animationend"].forEach(function(a){b[h](a,V,!0)}),/d$|^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 * .jpg image fallback 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.
May be useful.
